Initial commit: router front-door vLLM stack

Three always-running vLLM services (text TP=2 GPU0+1, ocr + embed on GPU2,
sleep mode) behind a FastAPI router that auto-wakes models on request.
Tiered idle (sleep 15 min / offload 3 h), depth-aware 503s with
Retry-After, persisted wake-intent recovery, admin API on 127.0.0.1:8010.
Routine control via vllmctl is pure HTTP — no docker on the request path.

Verified: 91 router unit tests + 15-test E2E on real hardware
(measurements in CALIBRATION.md; design record in
.claude/memory/router-front-door-plan.md).

Old nginx stack files removed before git init; design survives in
.claude/memory/sleep-mode-implementation-plan.md.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

router/requirements.txt

@@ -0,0 +1,10 @@
+# Pinned (plan section 6).  Direct dependencies only; the transitive set
+# (starlette, pydantic, anyio, ...) is resolved by pip at build time and
+# recorded by the image build.
+#
+#   fastapi  == 0.141.1   (current stable, verified with starlette 1.6)
+#   uvicorn  == 0.52.3    (two Server instances on one asyncio loop)
+#   httpx    == 0.28.1    (AsyncClient streaming proxy)
+fastapi==0.141.1
+uvicorn==0.52.3
+httpx==0.28.1