Initial commit: API gateway with admin console

- FastAPI async gateway with httpx proxying to multiple upstreams
- SQLite database with SQLAlchemy ORM
- Admin console: manage services, users, API keys, endpoint access
- Per-key, per-endpoint granular access control
- OpenAPI document sync and caching (5-minute TTL)
- Request/response logging with full transaction inspection
- In-memory rate limiting (per-key, fixed-window)
- Tiered log retention (7d payloads, 90d rows, incremental vacuum)
- TLS verification toggle per service (for self-signed certificates)
- Service connectivity validation with automatic endpoint refresh
- Request browser with filters and deep-link inspection
- Docker setup with persistent volume
- Modal forms for create/edit flows

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.claude/launch.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "gateway",
+      "runtimeExecutable": ".venv\\Scripts\\python.exe",
+      "runtimeArgs": ["-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8090"],
+      "port": 8090
+    }
+  ]
+}