feat(oauth): generische OAuth2-Pipeline ueber RVS-Callback (Spotify/Google/GitHub/Strava/MS)

Bisher musste Stefan bei OAuth-Flows manuell den Auth-Code aus der
Browser-URL kopieren (redirect_uri war localhost). Jetzt: RVS hat einen
HTTP-Listener auf demselben Port wie der WebSocket, Provider redirecten
nach Auth zu https://{RVS_HOST}/oauth/callback/{service}, RVS broadcastet,
aria-bridge forwarded, Brain matched state + tauscht code gegen Token.
Token-Refresh laeuft automatisch.

- rvs/server.js: hybrid http.createServer + WebSocketServer{noServer}.
  Route GET /oauth/callback/{service}, broadcast oauth_callback an alle
  Raeume, schoene Dark-Mode-HTML-Antwort an den Browser (Auto-Close 4s).
- bridge/aria_bridge.py: empfaengt oauth_callback, POSTet an Brain
  /internal/oauth-callback.
- aria-brain/oauth.py: neuer Manager. Pending-Store mit state+TTL,
  Token-Exchange (Basic-Auth oder Body je nach Provider), persistente
  Speicherung in /shared/config/oauth_tokens.json (mode 0600),
  Token-Refresh wenn <60s Restzeit. Vordefinierte Configs fuer Spotify,
  Google, GitHub, Strava, Microsoft.
- aria-brain/agent.py: META-Tools oauth_authorize / oauth_get_token /
  oauth_revoke.
- aria-brain/prompts.py: System-Prompt-Block zeigt ARIA die feste
  Callback-URL als Quelle der Wahrheit + aktuelle Service-States.
- aria-brain/main.py: HTTP-Endpoints /oauth/services, /oauth/apps,
  /oauth/authorize, /oauth/{service}/revoke, /internal/oauth-callback.
- diagnostic: neue Section "OAuth-Apps". Pro Service Karte mit Status,
  client_id + client_secret (Passwort-Toggle), Speichern + Autorisieren-
  Buttons. Authorize oeffnet Provider-Auth in neuem Tab.
- docker-compose.yml: brain-env um RVS_HOST + RVS_PORT_PUBLIC + RVS_TLS
  ergaenzt (Brain braucht die Werte zum Bau der Callback-URL).
- .env.example: RVS_PORT_PUBLIC + Brain-Timeout-Vars (PROXY_TIMEOUT_SEC
  + Connect/Write/Pool) dokumentiert.
- README.md: OAuth-Pipeline + ARIA-Live-Mirror in Diagnostic-Section,
  OAuth-Apps in Einstellungen-Tab erwaehnt.
- issue.md: OAuth-Pipeline + Brain-Timeout-Fix als erledigt dokumentiert.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

aria-brain/main.py

@@ -36,6 +36,7 @@ import metrics as metrics_mod
 import triggers as triggers_mod
 import watcher as watcher_mod
 import background as background_mod
+import oauth as oauth_mod
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(name)s: %(message)s")
 logger = logging.getLogger("aria-brain")
@@ -849,3 +850,118 @@ async def skills_import(request: Request, overwrite: bool = False):
     except ValueError as exc:
         raise HTTPException(400, str(exc))
     return {"imported": manifest}
+
+
+# ── OAuth ─────────────────────────────────────────────────────────
+
+
+@app.get("/oauth/services")
+async def oauth_services_list():
+    """Liste aller Services mit Status (configured/authenticated/expires)."""
+    return {"services": oauth_mod.list_services()}
+
+
+@app.get("/oauth/apps")
+async def oauth_apps_get():
+    """Liefert die persistierte Provider-Config (client_id sichtbar, client_secret
+    NICHT — wer den Wert braucht muss ihn neu eintragen). Fuer Diagnostic-UI."""
+    apps = oauth_mod._load_json(oauth_mod.APPS_FILE)
+    safe = {}
+    for service, entry in apps.items():
+        if not isinstance(entry, dict):
+            continue
+        safe[service] = {
+            "client_id": entry.get("client_id", ""),
+            "has_client_secret": bool(entry.get("client_secret")),
+            "scopes": entry.get("scopes"),
+            "auth_url": entry.get("auth_url"),
+            "token_url": entry.get("token_url"),
+        }
+    return {"apps": safe, "defaults": list(oauth_mod.DEFAULT_PROVIDERS.keys())}
+
+
+class OAuthAppIn(BaseModel):
+    service: str
+    client_id: str = ""
+    client_secret: str = ""
+    scopes: Optional[List[str]] = None
+    auth_url: Optional[str] = None
+    token_url: Optional[str] = None
+
+
+@app.post("/oauth/apps")
+async def oauth_apps_set(body: OAuthAppIn):
+    """Speichert/aktualisiert eine Provider-Config. Leerer client_secret laesst
+    den bestehenden Wert stehen (damit man die Form ohne Re-Eingabe absenden
+    kann fuer reine scope-Aenderungen)."""
+    service = (body.service or "").strip()
+    if not service or not service.isidentifier() and not all(c.isalnum() or c in "_-" for c in service):
+        raise HTTPException(400, "Ungueltiger service-Name (a-z0-9_- erlaubt)")
+    apps = oauth_mod._load_json(oauth_mod.APPS_FILE)
+    entry = apps.get(service) or {}
+    if body.client_id:
+        entry["client_id"] = body.client_id.strip()
+    if body.client_secret:
+        entry["client_secret"] = body.client_secret.strip()
+    if body.scopes is not None:
+        entry["scopes"] = body.scopes
+    if body.auth_url:
+        entry["auth_url"] = body.auth_url.strip()
+    if body.token_url:
+        entry["token_url"] = body.token_url.strip()
+    apps[service] = entry
+    oauth_mod._save_json(oauth_mod.APPS_FILE, apps)
+    logger.info("OAuth-App %s gespeichert (client_id=%s, has_secret=%s)",
+                service, entry.get("client_id", ""), bool(entry.get("client_secret")))
+    return {"ok": True, "service": service}
+
+
+@app.delete("/oauth/apps/{service}")
+async def oauth_apps_delete(service: str):
+    apps = oauth_mod._load_json(oauth_mod.APPS_FILE)
+    if service in apps:
+        apps.pop(service)
+        oauth_mod._save_json(oauth_mod.APPS_FILE, apps)
+    # Token auch wegwerfen
+    oauth_mod.revoke(service)
+    return {"ok": True}
+
+
+@app.post("/oauth/{service}/revoke")
+async def oauth_revoke_endpoint(service: str):
+    return {"ok": oauth_mod.revoke(service)}
+
+
+class OAuthAuthorizeIn(BaseModel):
+    service: str
+    scopes: Optional[List[str]] = None
+
+
+@app.post("/oauth/authorize")
+async def oauth_authorize_endpoint(body: OAuthAuthorizeIn):
+    """Baut eine Authorize-URL fuer einen Service. Diagnostic kann das nutzen
+    um den Auth-Flow manuell anzustossen. ARIA selbst nutzt das Tool
+    `oauth_authorize` (in agent._dispatch_tool gemapped auf die gleiche Logik)."""
+    try:
+        return oauth_mod.build_authorize_url(body.service, scopes=body.scopes)
+    except RuntimeError as exc:
+        raise HTTPException(400, str(exc))
+
+
+@app.post("/internal/oauth-callback")
+async def oauth_callback_internal(request: Request):
+    """Wird von aria-bridge gerufen wenn ein RVS oauth_callback ankommt.
+    Macht den state-Match + token-exchange und persistiert."""
+    try:
+        body = await request.json()
+    except Exception as exc:
+        raise HTTPException(400, f"bad json: {exc}")
+    service = (body.get("service") or "").strip()
+    code = (body.get("code") or "").strip()
+    state = (body.get("state") or "").strip()
+    err = body.get("error") or None
+    err_desc = body.get("errorDescription") or None
+    if not service:
+        raise HTTPException(400, "service erforderlich")
+    result = oauth_mod.handle_callback(service, code, state, error=err, error_description=err_desc)
+    return result