feat(keys): harness snippets for every OS + install command when missing

The harness auto-setup scripts were bash-only (heredocs, mkdir -p) — useless
on Windows. Every scripty snippet now exists in two flavors behind a
🐧🍎/🪟 switch (auto-detected from the browser): bash heredocs for
Linux/macOS and PowerShell here-strings ($env:, New-Item, @'..'@,
curl.exe with backtick continuations) for Windows. SDK snippets and GUI
instructions stay OS-independent.

And when detection says a harness is NOT installed on the gateway machine,
the status line now offers its one-line install command for the selected OS
(claude.ai install.sh / install.ps1, npm -g for Codex and OpenCode-on-
Windows, code --install-extension for Continue/Cline) with a copy button.
1 string ×7 languages.

web/js/i18n/de.js

@@ -643,4 +643,5 @@ export default {
   "keys.form.budgetHint": "Überschreiten die Monatsausgaben des Kontos die Grenze, werden Anfragen mit 429 insufficient_quota abgelehnt.",
   "keys.budgetOf": "Budget {b}/Mon.",
   "dash.kpi.orBalance": "OpenRouter-Guthaben",
+  "keys.h.install": "Installieren:",
 };

web/js/i18n/en.js

@@ -636,4 +636,5 @@ export default {
   "keys.form.budgetHint": "Requests are rejected with 429 insufficient_quota once the account's month-to-date spend crosses this.",
   "keys.budgetOf": "budget {b}/mo",
   "dash.kpi.orBalance": "OpenRouter balance",
+  "keys.h.install": "Install:",
 };

web/js/i18n/es.js

@@ -643,4 +643,5 @@ export default {
   "keys.form.budgetHint": "Cuando el gasto del mes supera el techo, las peticiones se rechazan con 429 insufficient_quota.",
   "keys.budgetOf": "presupuesto {b}/mes",
   "dash.kpi.orBalance": "Saldo OpenRouter",
+  "keys.h.install": "Instalar:",
 };

web/js/i18n/fr.js

@@ -643,4 +643,5 @@ export default {
   "keys.form.budgetHint": "Quand les dépenses du mois dépassent le plafond, les requêtes sont rejetées avec 429 insufficient_quota.",
   "keys.budgetOf": "budget {b}/mois",
   "dash.kpi.orBalance": "Solde OpenRouter",
+  "keys.h.install": "Installer :",
 };

web/js/i18n/ru.js

@@ -635,4 +635,5 @@ export default {
   "keys.form.budgetHint": "Когда траты аккаунта за месяц превысят потолок, запросы отклоняются с 429 insufficient_quota.",
   "keys.budgetOf": "бюджет {b}/мес",
   "dash.kpi.orBalance": "Баланс OpenRouter",
+  "keys.h.install": "Установить:",
 };

web/js/i18n/tr.js

@@ -643,4 +643,5 @@ export default {
   "keys.form.budgetHint": "Hesabın aylık harcaması tavanı aşınca istekler 429 insufficient_quota ile reddedilir.",
   "keys.budgetOf": "bütçe {b}/ay",
   "dash.kpi.orBalance": "OpenRouter bakiyesi",
+  "keys.h.install": "Kurulum:",
 };

web/js/i18n/zh.js

@@ -643,4 +643,5 @@ export default {
   "keys.form.budgetHint": "当账户当月支出超过上限时，请求将被拒绝并返回 429 insufficient_quota。",
   "keys.budgetOf": "预算 {b}/月",
   "dash.kpi.orBalance": "OpenRouter 余额",
+  "keys.h.install": "安装：",
 };

web/js/views/keys.js

@@ -55,9 +55,73 @@ export async function renderKeys() {
     const origin = location.origin;
     const base = origin + "/v1";
     const key = lastCreatedKey || (openMode ? "sk-anything" : "<" + t("keys.snip.keyPh") + ">");
+    // Every scripty snippet exists in two OS flavors: bash heredocs for
+    // Linux/macOS and PowerShell here-strings for Windows. SDK snippets
+    // (python/js) and GUI instructions are OS-independent.
+    let os = /win/i.test(navigator.platform || "") ? "ps" : "sh";
     // Harness auto-setup scripts first (the gateway speaks OpenAI at /v1/* and
     // Anthropic at /v1/messages, so Claude Code connects natively), SDKs after.
-    const snips = {
+    const buildSnips = (osKind) => osKind === "ps" ? {
+      "Claude Code": `# ${t("keys.h.claude")}
+$env:ANTHROPIC_BASE_URL = "${origin}"
+$env:ANTHROPIC_AUTH_TOKEN = "${key}"
+$env:ANTHROPIC_MODEL = "cortiq-auto"
+
+claude`,
+      Codex: `# ${t("keys.h.codex")}
+New-Item -ItemType Directory -Force "$HOME\\.codex" | Out-Null
+Add-Content "$HOME\\.codex\\config.toml" @'
+model = "cortiq-auto"
+model_provider = "cortiq"
+
+[model_providers.cortiq]
+name = "Cortiq Gateway"
+base_url = "${base}"
+env_key = "CORTIQ_API_KEY"
+wire_api = "chat"
+'@
+$env:CORTIQ_API_KEY = "${key}"
+
+codex`,
+      OpenCode: `# ${t("keys.h.opencode")}
+New-Item -ItemType Directory -Force "$HOME\\.config\\opencode" | Out-Null
+Set-Content "$HOME\\.config\\opencode\\opencode.json" @'
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {
+    "cortiq": {
+      "npm": "@ai-sdk/openai-compatible",
+      "name": "Cortiq Gateway",
+      "options": { "baseURL": "${base}", "apiKey": "${key}" },
+      "models": { "cortiq-auto": { "name": "Cortiq Auto (smart routing)" } }
+    }
+  }
+}
+'@
+
+opencode`,
+      Continue: `# ${t("keys.h.continue")}
+New-Item -ItemType Directory -Force "$HOME\\.continue" | Out-Null
+Add-Content "$HOME\\.continue\\config.yaml" @'
+models:
+  - name: Cortiq Auto
+    provider: openai
+    model: cortiq-auto
+    apiBase: ${base}
+    apiKey: ${key}
+'@`,
+      Cline: `${t("keys.h.cline1")}
+  API Provider:  OpenAI Compatible
+  Base URL:      ${base}
+  API Key:       ${key}
+  Model ID:      cortiq-auto
+
+${t("keys.h.cline2")}`,
+      curl: `curl.exe ${base}/chat/completions \`
+  -H "Authorization: Bearer ${key}" \`
+  -H "Content-Type: application/json" \`
+  -d '{"model":"cortiq-auto","messages":[{"role":"user","content":"Привет!"}]}'`,
+    } : {
       "Claude Code": `# ${t("keys.h.claude")}
 export ANTHROPIC_BASE_URL="${origin}"
 export ANTHROPIC_AUTH_TOKEN="${key}"
@@ -131,6 +195,11 @@ const resp = await client.chat.completions.create({
 });
 console.log(resp.choices[0].message.content);`,
     };
+    const shSnips = buildSnips("sh");
+    const psSnips = buildSnips("ps");
+    // python/js/Cline одинаковы — дополняем ps-набор из sh
+    for (const k of Object.keys(shSnips)) if (!psSnips[k]) psSnips[k] = shSnips[k];
+    let snips = os === "ps" ? psSnips : shSnips;
     let cur = "Claude Code";
     const pre = h("pre", { class: "conv-log snippet" }, snips[cur]);
     const seg = h(
@@ -167,7 +236,15 @@ console.log(resp.choices[0].message.content);`,
     }).catch(() => {});
 
     // Detected harnesses: ✓ on the tab when installed on the gateway machine,
-    // status line under the snippet ("installed" / "already configured").
+    // status line under the snippet ("installed" / "already configured") —
+    // and a one-line INSTALL command (per OS) when it's missing.
+    const INSTALL = {
+      "Claude Code": { sh: "curl -fsSL https://claude.ai/install.sh | bash", ps: "irm https://claude.ai/install.ps1 | iex" },
+      Codex: { sh: "npm install -g @openai/codex", ps: "npm install -g @openai/codex" },
+      OpenCode: { sh: "curl -fsSL https://opencode.ai/install | bash", ps: "npm install -g opencode-ai" },
+      Continue: { sh: "code --install-extension Continue.continue", ps: "code --install-extension Continue.continue" },
+      Cline: { sh: "code --install-extension saoudrizwan.claude-dev", ps: "code --install-extension saoudrizwan.claude-dev" },
+    };
     let detected = {};
     const statusHost = h("div", { class: "small", style: "margin-top:6px" });
     function paintStatus() {
@@ -179,7 +256,19 @@ console.log(resp.choices[0].message.content);`,
       statusHost.innerHTML = "";
       if (d.configured) mount(statusHost, h("span", { class: "ok" }, "✓ " + t("keys.h.st.configured")));
       else if (d.installed) mount(statusHost, h("span", { class: "ok" }, "✓ " + t("keys.h.st.installed")));
-      else mount(statusHost, h("span", { class: "muted" }, "○ " + t("keys.h.st.notFound")));
+      else {
+        const cmd = (INSTALL[cur] || {})[os];
+        const copyInstall = h("button", { class: "btn ghost sm", onClick: async () => {
+          await navigator.clipboard.writeText(cmd);
+          toast(t("common.copied"), "good");
+        } }, "⧉");
+        mount(statusHost,
+          h("span", { class: "muted" }, "○ " + t("keys.h.st.notFound")),
+          cmd ? h("div", { class: "flex", style: "gap:6px; align-items:center; margin-top:4px" },
+            h("span", { class: "muted" }, t("keys.h.install")),
+            h("code", { class: "mono small", style: "background:var(--panel-2,#23252c); padding:2px 8px; border-radius:6px" }, cmd),
+            copyInstall) : null);
+      }
     }
     api.harnesses().then((d) => {
       detected = d || {};
@@ -190,6 +279,22 @@ console.log(resp.choices[0].message.content);`,
       paintStatus();
     }).catch(() => {});
 
+    // OS switch: bash for Linux/macOS, PowerShell for Windows (auto-detected)
+    const osSeg = h(
+      "div",
+      { class: "seg" },
+      h("button", { class: os === "sh" ? "active" : "" }, "🐧🍎 Linux / macOS"),
+      h("button", { class: os === "ps" ? "active" : "" }, "🪟 Windows")
+    );
+    osSeg.querySelectorAll("button").forEach((b, i) =>
+      b.addEventListener("click", () => {
+        os = i === 0 ? "sh" : "ps";
+        snips = os === "ps" ? psSnips : shSnips;
+        osSeg.querySelectorAll("button").forEach((x, j) => x.classList.toggle("active", j === (os === "sh" ? 0 : 1)));
+        pre.textContent = snips[cur];
+        paintStatus();
+      }));
+
     const copy = h("button", { class: "btn ghost sm" }, "⧉ " + t("common.copy"));
     copy.addEventListener("click", async () => {
       await navigator.clipboard.writeText(pre.textContent);
@@ -201,7 +306,7 @@ console.log(resp.choices[0].message.content);`,
       h("div", { class: "card-title" }, "🔌 " + t("keys.snip.title")),
       h("div", { class: "muted small", style: "margin-bottom:8px" },
         lastCreatedKey ? t("keys.snip.withKey") : openMode ? t("keys.snip.openMode") : t("keys.snip.hint")),
-      h("div", { class: "flex", style: "gap:8px; margin-bottom:8px; flex-wrap:wrap" }, seg, h("div", { class: "grow" }), copy),
+      h("div", { class: "flex", style: "gap:8px; margin-bottom:8px; flex-wrap:wrap" }, seg, h("div", { class: "grow" }), osSeg, copy),
       pre,
       statusHost,
       protoWarn,