Add Phase 1 MVP: D&D text-adventure server

FastAPI + Postgres backend with fastapi-users auth, games/characters
CRUD, and a WebSocket chat endpoint where an x.ai Grok DM narrates
play, rolls dice, and maintains character sheets via tool calls.
React + Tailwind frontend covers registration/login, game list and
creation, participation-code join flow, character viewer, and a
real-time chat session view. Docker Compose skeleton (Postgres +
backend) included; Caddy/frontend container wiring is deferred to
the deploy milestone.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/app/main.py

@@ -0,0 +1,44 @@
+import logging
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.routes_characters import router as characters_router
+from app.api.routes_games import router as games_router
+from app.api.ws_game import router as ws_router
+from app.auth.users import auth_backend, fastapi_users
+from app.config import settings
+from app.schemas.user import UserCreate, UserRead, UserUpdate
+
+logging.basicConfig(level=logging.INFO, format="%(levelname)s:%(name)s:%(message)s")
+
+app = FastAPI(title="DungeonsDragons")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[settings.frontend_origin],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(
+    fastapi_users.get_auth_router(auth_backend), prefix="/auth/jwt", tags=["auth"]
+)
+app.include_router(
+    fastapi_users.get_register_router(UserRead, UserCreate), prefix="/auth", tags=["auth"]
+)
+app.include_router(
+    fastapi_users.get_reset_password_router(), prefix="/auth", tags=["auth"]
+)
+app.include_router(
+    fastapi_users.get_users_router(UserRead, UserUpdate), prefix="/users", tags=["users"]
+)
+app.include_router(games_router)
+app.include_router(characters_router)
+app.include_router(ws_router)
+
+
+@app.get("/health")
+async def health() -> dict[str, str]:
+    return {"status": "ok"}