feat: Schritt 2 — mGPUmanager MVP routing + /v1/status

Go daemon listening on :8770 that fronts mvoice (8766), whisper-server
(8178), ollama (11434), comfyui (8188) behind a single /v1 façade.

What this MVP does:
- Loads config/consumers.yaml: routing table, per-consumer URL + health +
  paths + vram_resident_mib + can_coexist_with + load/unload routes.
- Background health probe (5s) on every consumer; refuses fast with a
  structured 503 if the last probe failed (no Felix-Banholzer-style
  silent fallback).
- POST /v1/{tts,stt,llm,image} proxies the request body + Content-Type
  to the routed consumer's path and streams the response back.
- GET /audio/* proxies to audio_proxy consumer (wa.sh fetches its WAV
  this way).
- GET /v1/status exposes live GPU sample (nvidia-smi every 2s),
  per-consumer health/loaded/gpu_resident_mib/active/total_requests,
  scheduler stats.
- GET /healthz, GET / — broker liveness.

The Scheduler interface is in place but the implementation is
'Passthrough' — every job runs immediately, no lock, no queue. Schritt 4
replaces it with a serialising mutex; Schritt 5 adds VRAM-pressure
eviction. The interface boundary means server.go stays unchanged.

Out of scope here:
- Schritt 3: wa.sh migration (parallel work in mAi).
- Schritt 4: queue + global GPU lock.
- Schritt 5: nvidia-smi-driven LRU eviction.

Tests: config validation (good/bad), proxy forwards body, audio proxy
streams bytes, unhealthy consumer returns 503, /v1/status JSON shape.

Refs: m/mGPUmanager#1

Makefile

@@ -0,0 +1,35 @@
+# mGPUmanager build + deploy targets.
+#
+# `make build`   — compile the Go binary into ./bin/mgpumanager.
+# `make test`    — go test ./...
+# `make run`     — run locally against ./config/consumers.yaml.
+# `make deploy`  — rsync binary + config + systemd unit to mRock,
+#                  reload systemd, restart the service.
+
+BIN := bin/mgpumanager
+PKG := ./cmd/mgpumanager
+
+GO ?= go
+HOST ?= mrock
+REMOTE_DIR ?= /home/m/dev/mGPUmanager
+
+.PHONY: build test run deploy clean
+
+build:
+	mkdir -p bin
+	$(GO) build -trimpath -ldflags="-s -w" -o $(BIN) $(PKG)
+
+test:
+	$(GO) test ./...
+
+run: build
+	./$(BIN) --config config/consumers.yaml --log-level debug
+
+deploy: build
+	rsync -a --mkpath $(BIN) $(HOST):$(REMOTE_DIR)/$(BIN)
+	rsync -a --mkpath config/consumers.yaml $(HOST):$(REMOTE_DIR)/config/consumers.yaml
+	rsync -a --mkpath systemd/mgpumanager.service $(HOST):$(REMOTE_DIR)/systemd/mgpumanager.service
+	ssh $(HOST) "sudo cp $(REMOTE_DIR)/systemd/mgpumanager.service /etc/systemd/system/mgpumanager.service && sudo systemctl daemon-reload && sudo systemctl enable mgpumanager.service && sudo systemctl restart mgpumanager.service && sudo systemctl status mgpumanager.service --no-pager -l"
+
+clean:
+	rm -rf bin