Switch to per-service subdomains, shared token store

URLs: mail.mcp.home.slohmaier.de, calendar.mcp..., etc.
No more path-prefix routing — each service has its own domain.
OAuth tokens stored in shared .active_tokens.json file so all
services can validate tokens issued by any service.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -3,3 +3,4 @@ __pycache__/
 *.pyc
 tokens.json
 config.json
+.active_tokens.json

common.py

@@ -36,10 +36,23 @@ def load_config():
 
 _tokens_cache = None
 _current_user: contextvars.ContextVar[str | None] = contextvars.ContextVar("current_user", default=None)
-_access_tokens: dict[str, dict] = {}
+_TOKEN_STORE = os.path.join(BASE_DIR, ".active_tokens.json")
 _auth_codes: dict[str, dict] = {}
 
 
+def _load_access_tokens():
+    try:
+        with open(_TOKEN_STORE) as f:
+            return json.load(f)
+    except (FileNotFoundError, json.JSONDecodeError):
+        return {}
+
+
+def _save_access_tokens(tokens):
+    with open(_TOKEN_STORE, "w") as f:
+        json.dump(tokens, f)
+
+
 def _load_tokens():
     global _tokens_cache
     if _tokens_cache is None:
@@ -65,11 +78,13 @@ def _resolve_client(client_id, client_secret):
 
 
 def _resolve_access_token(token):
-    info = _access_tokens.get(token)
+    tokens = _load_access_tokens()
+    info = tokens.get(token)
     if not info:
         return None
     if info.get("expires_at", 0) < time.time():
-        del _access_tokens[token]
+        del tokens[token]
+        _save_access_tokens(tokens)
         return None
     return info["user"]
 
@@ -87,8 +102,7 @@ def _verify_pkce(code_verifier, code_challenge, method):
 async def oauth_metadata(request: Request):
     proto = request.headers.get("x-forwarded-proto", request.url.scheme)
     host = request.headers.get("host", "")
-    prefix = request.headers.get("x-forwarded-prefix", "")
-    base = f"{proto}://{host}{prefix}"
+    base = f"{proto}://{host}"
     return JSONResponse({
         "issuer": base,
         "authorization_endpoint": base + "/authorize",
@@ -171,7 +185,12 @@ async def oauth_token(request: Request):
 
     access_token = secrets.token_urlsafe(48)
     expires_in = 86400
-    _access_tokens[access_token] = {"user": user, "expires_at": time.time() + expires_in}
+    tokens = _load_access_tokens()
+    # Cleanup expired
+    now = time.time()
+    tokens = {k: v for k, v in tokens.items() if v.get("expires_at", 0) > now}
+    tokens[access_token] = {"user": user, "expires_at": now + expires_in}
+    _save_access_tokens(tokens)
 
     return JSONResponse({
         "access_token": access_token,