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/fr.js

@@ -602,4 +602,18 @@ export default {
   "bm.spent": "dépensé",
   "bm.verdict": "🏁 Terminé : réponses {p}, dépensé {s}",
   "bm.clearHistory": "Tout effacer",
+
+  // harness auto-setup (API keys view)
+  "keys.h.claude": "Claude Code — collez dans le terminal (la passerelle parle nativement le protocole Anthropic) :",
+  "keys.h.codex": "Codex — ajoute le fournisseur à ~/.codex/config.toml et démarre :",
+  "keys.h.opencode": "OpenCode — écrit ~/.config/opencode/opencode.json (écrase !) et démarre :",
+  "keys.h.continue": "Continue (VS Code / JetBrains) — ajoute le modèle à ~/.continue/config.yaml :",
+  "keys.h.cline1": "Cline (VS Code) — dans les réglages de l'extension, choisissez :",
+  "keys.h.cline2": "Réglages → API Provider → OpenAI Compatible, puis collez les valeurs ci-dessus.",
+  "keys.h.note": "cortiq-auto = routage intelligent : le routeur choisit le modèle à chaque requête. Pour en fixer un, indiquez son nom exact. Sous Windows, lancez les scripts dans Git Bash / WSL ou définissez les mêmes variables via l'environnement système.",
+  "keys.h.protoOff": "Le protocole Anthropic (/v1/messages) est désactivé — Claude Code ne pourra pas se connecter.",
+  "keys.h.enableProto": "Activer",
+  "keys.h.st.installed": "Installé sur la machine de la passerelle",
+  "keys.h.st.configured": "Déjà configuré pour cette passerelle",
+  "keys.h.st.notFound": "Introuvable sur la machine de la passerelle",
 };