feat: wire brain service to platform gateway

- Gateway proxies /api/brain/* to brain-api:8200/api/* via pangolin network
- User identity injected via X-Gateway-User-Id header
- Brain app registered in gateway database (sort_order 9)
- Added to GATEWAY_KEY_SERVICES for dashboard integration
- Tested: health, config, list, create all working through gateway

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

gateway/config.py

@@ -22,6 +22,7 @@ SHELFMARK_URL = os.environ.get("SHELFMARK_URL", "http://shelfmark:8084")
 SPOTIZERR_URL = os.environ.get("SPOTIZERR_URL", "http://spotizerr-app:7171")
 BUDGET_URL = os.environ.get("BUDGET_BACKEND_URL", "http://localhost:3001")
 TASKS_URL = os.environ.get("TASKS_BACKEND_URL", "http://tasks-service:8098")
+BRAIN_URL = os.environ.get("BRAIN_BACKEND_URL", "http://brain-api:8200")
 
 # ── Service API keys (for internal service auth) ──
 INVENTORY_SERVICE_API_KEY = os.environ.get("INVENTORY_SERVICE_API_KEY", "")

gateway/dashboard.py

@@ -188,7 +188,7 @@ def handle_dashboard(handler, user):
     conn.close()
 
     # Services that use gateway-injected API keys (not per-user tokens)
-    GATEWAY_KEY_SERVICES = {"inventory", "reader", "books", "music", "budget", "tasks"}
+    GATEWAY_KEY_SERVICES = {"inventory", "reader", "books", "music", "budget", "tasks", "brain"}
     widgets = []
     futures = {}
 

gateway/database.py

@@ -8,7 +8,7 @@ import bcrypt
 
 from config import (
     DB_PATH, TRIPS_URL, FITNESS_URL, INVENTORY_URL,
-    MINIFLUX_URL, SHELFMARK_URL, SPOTIZERR_URL, BUDGET_URL, TASKS_URL,
+    MINIFLUX_URL, SHELFMARK_URL, SPOTIZERR_URL, BUDGET_URL, TASKS_URL, BRAIN_URL,
 )
 
 
@@ -129,6 +129,13 @@ def init_db():
         conn.commit()
         print("[Gateway] Added tasks app")
 
+    # Ensure brain app exists
+    brain = c.execute("SELECT id FROM apps WHERE id = 'brain'").fetchone()
+    if not brain:
+        c.execute("INSERT INTO apps VALUES ('brain', 'Brain', 'brain', '/brain', ?, 9, 1, NULL)", (BRAIN_URL,))
+        conn.commit()
+        print("[Gateway] Added brain app")
+
     # Seed admin user from env vars if no users exist
     import os
     user_count = c.execute("SELECT COUNT(*) FROM users").fetchone()[0]

gateway/server.py

@@ -303,6 +303,11 @@ class GatewayHandler(ResponseMixin, BaseHTTPRequestHandler):
             if user:
                 headers["X-Gateway-User-Id"] = str(user["id"])
                 headers["X-Gateway-User-Name"] = user.get("display_name", user.get("username", ""))
+        elif service_id == "brain":
+            # Inject user identity for the brain service
+            if user:
+                headers["X-Gateway-User-Id"] = str(user["id"])
+                headers["X-Gateway-User-Name"] = user.get("display_name", user.get("username", ""))
         elif user:
             svc_token = get_service_token(user["id"], service_id)
             if svc_token: