feat(keys): one-paste harness setup — Claude Code, Codex, OpenCode, Continue, Cline

The "connect your app" card in the API-keys view now leads with auto-setup
scripts for popular coding harnesses, each pre-filled with this gateway's URL
and the freshly created key:

  Claude Code — env exports (the gateway speaks Anthropic /v1/messages
      natively; the protocol is now ON by default, and when a config has it
      off the tab shows a warning with a one-click Enable button)
  Codex — appends a [model_providers.cortiq] block to ~/.codex/config.toml
  OpenCode — writes the provider into opencode.json
  Continue — appends the model to ~/.continue/config.yaml
  Cline — the exact values to paste into the extension settings

The gateway also detects which harnesses are already present on its machine
(binaries across PATH + common install dirs, config files under home) via
GET /admin/api/harnesses: installed tabs get a ✓, and the status line under
the snippet says "installed" or "already configured for this gateway" when
the harness config mentions cortiq. Works on Linux/macOS/Windows.

curl / python / javascript SDK snippets stay as before. 16 new strings in
all 7 languages.

web/js/i18n/en.js

@@ -595,4 +595,18 @@ export default {
   "bm.spent": "spent",
   "bm.verdict": "🏁 Done: answers {p}, spent {s}",
   "bm.clearHistory": "Clear all",
+
+  // harness auto-setup (API keys view)
+  "keys.h.claude": "Claude Code — paste into the terminal (the gateway speaks the Anthropic protocol natively):",
+  "keys.h.codex": "Codex — appends the provider to ~/.codex/config.toml and starts:",
+  "keys.h.opencode": "OpenCode — writes ~/.config/opencode/opencode.json (overwrites!) and starts:",
+  "keys.h.continue": "Continue (VS Code / JetBrains) — appends the model to ~/.continue/config.yaml:",
+  "keys.h.cline1": "Cline (VS Code) — in extension settings pick:",
+  "keys.h.cline2": "Settings → API Provider → OpenAI Compatible, then paste the values above.",
+  "keys.h.note": "cortiq-auto = smart routing: the router picks the model per request. Use an exact model name to pin one. On Windows run the scripts in Git Bash / WSL, or set the same variables via the system environment settings.",
+  "keys.h.protoOff": "The Anthropic protocol (/v1/messages) is disabled — Claude Code will not connect.",
+  "keys.h.enableProto": "Enable",
+  "keys.h.st.installed": "Installed on the gateway machine",
+  "keys.h.st.configured": "Already configured for this gateway",
+  "keys.h.st.notFound": "Not found on the gateway machine",
 };