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>

.env.example

@@ -0,0 +1,9 @@
+# Copy to .env and fill in. Only these three are read by compose.yml;
+# per-model serving args live in compose.yml itself.
+HF_TOKEN=
+VLLM_VERSION=v0.27.1
+MODEL_ROOT=/data/home/renbaibing/huggingface
+
+# Optional client-side convenience (open-deep-research etc.)
+OPENAI_API_KEY=EMPTY
+OPENAI_BASE_URL=http://127.0.0.1:8000/v1