feat(dev): add compose files and dev-login bypass route

- compose.prod.yml: production stack with registry image, healthcheck,
  migration service
- compose.test.yml: local test stack with source mount and LOCAL=true
- routes/dev-login.ts: fake admin JWT login, only active when LOCAL=true
- routes/_middleware.ts: expose /dev-login as public route

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

compose.test.yml

@@ -0,0 +1,49 @@
+services:
+  db:
+    image: postgres:17-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_PASSWORD: testpass
+      POSTGRES_USER: postgres
+      POSTGRES_DB: polympr_test
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  migrate:
+    image: denoland/deno:alpine
+    working_dir: /app
+    volumes:
+      - .:/app
+    command: task migrate
+    environment:
+      POSTGRES_HOST: db
+      POSTGRES_PORT: 5432
+      POSTGRES_USER: postgres
+      POSTGRES_PASS: testpass
+      POSTGRES_DB: polympr_test
+      LOCAL: "true"
+    depends_on:
+      db:
+        condition: service_healthy
+
+  app:
+    image: denoland/deno:alpine
+    working_dir: /app
+    volumes:
+      - .:/app
+    command: run -A --unstable-ffi main.ts
+    ports:
+      - "4430:443"
+    environment:
+      POSTGRES_HOST: db
+      POSTGRES_PORT: 5432
+      POSTGRES_USER: postgres
+      POSTGRES_PASS: testpass
+      POSTGRES_DB: polympr_test
+      LOCAL: "true"
+    depends_on:
+      migrate:
+        condition: service_completed_successfully