feat: spirit engine — seance WS, entity minting/Codex, Piper TTS voices, wire telemetry

- WS /ws/session: modes, summon, anomaly fragments, streaming direct contact,
  passive wire-ghost ambient loop, per-user rate limits, event transcript
- entities: anomaly-signature fingerprinting, LLM minting + procedural
  fallback, Codex matching with contact counts and sightings
- tts: 8 local Piper voices (EN/ES), per-entity voice profiles, numpy
  effects chain (pitch/rate/bitcrush/echo/static)
- llm: streaming client, submit_stream in bounded queue, SpiritService
  with offline fallbacks for every channel
- routes: public /api/codex, /api/codex/{id}, /api/stats; /audio static mount
- models: Entity, EntitySighting, Event, ContactSession(entity_id, language)

backend/app/main.py

@@ -6,14 +6,19 @@ from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 
 import app.models  # noqa: F401 — registers models on Base.metadata before create_all
+from app.config import settings
 from app.db import Base, engine
 from app.routes.auth import router as auth_router
+from app.routes.codex import router as codex_router
+from app.ws import AUDIO_DIR
+from app.ws import router as ws_router
 
 FRONTEND_DIST = Path(__file__).resolve().parent.parent.parent / "frontend" / "dist"
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    AUDIO_DIR.mkdir(parents=True, exist_ok=True)
     async with engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
     yield
@@ -21,6 +26,8 @@ async def lifespan(app: FastAPI):
 
 app = FastAPI(title="Quantumancy", lifespan=lifespan)
 app.include_router(auth_router)
+app.include_router(codex_router)
+app.include_router(ws_router)
 
 
 @app.get("/healthz")
@@ -33,6 +40,11 @@ app.mount(
     StaticFiles(directory=FRONTEND_DIST / "assets", check_dir=False),
     name="frontend-assets",
 )
+app.mount(
+    "/audio",
+    StaticFiles(directory=AUDIO_DIR, check_dir=False),
+    name="spirit-audio",
+)
 
 
 @app.get("/{full_path:path}")