chore: move docker/ compose files and infra to repo root

Moved compose.yml, compose.prod.yml, DEPLOY.md, traefik/, and cron/ out
of docker/ into the repo root (docker/ removed). Updated every reference:

- Dockerfile: COPY paths for the cron stage
- .dockerignore: dropped the now-unneeded docker/!docker-cron
  exclude+exception pair (cron/ is just a normal top-level dir now, no
  special-casing needed)
- compose.prod.yml: build context ".." -> "." (Dockerfile and compose
  files are now siblings, not one level apart)
- CLAUDE.md, DEPLOY.md, compose.yml, traefik/epicure.yml,
  cron/run-digest.sh, weekly-digest route.ts: path references in comments/
  docs

Verified: both compose files validate, and all three Dockerfile targets
(runner/cron/migrator) build clean via a local --no-cache docker build
from the new layout.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

compose.yml

@@ -0,0 +1,71 @@
+# Dev-only infra: postgres/redis/minio. The app and the `digest-cron` container
+# (compose.prod.yml) aren't run here — use `pnpm dev` locally, and hit
+# POST /api/internal/cron/weekly-digest with the CRON_SECRET header directly if
+# you need to test the weekly digest send without waiting for the schedule.
+services:
+  postgres:
+    image: postgres:17-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: epicure
+      POSTGRES_USER: epicure
+      POSTGRES_PASSWORD: epicure
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U epicure"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    ports:
+      - "6380:6379"
+    volumes:
+      - redis_data:/data
+    command: redis-server --save 60 1
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  minio:
+    image: minio/minio:latest
+    restart: unless-stopped
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    volumes:
+      - minio_data:/data
+    command: server /data --console-address ":9001"
+    healthcheck:
+      test: ["CMD", "mc", "ready", "local"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  minio-init:
+    image: minio/mc:latest
+    depends_on:
+      minio:
+        condition: service_healthy
+    entrypoint: >
+      /bin/sh -c "
+        mc alias set local http://minio:9000 minioadmin minioadmin;
+        mc mb --ignore-existing local/epicure-uploads;
+        mc anonymous set download local/epicure-uploads;
+        exit 0;
+      "
+
+volumes:
+  postgres_data:
+  redis_data:
+  minio_data: