dev: switch to fully containerized Docker Compose workflow

- Replace tmux setup with a full Docker Compose development stack
- Update backend Dockerfile to use `cargo-chef` caching and `supervisord`
- Containerize frontend development server
- Update tests to run in isolated containers
- Remove legacy `papercrate.tmux`

docker-compose.test.yml

@@ -31,28 +31,33 @@ services:
       timeout: 5s
       retries: 5
 
-  admin-bootstrap:
+  test-runner:
     build:
       context: ./backend
+      dockerfile: Dockerfile
+      target: development
     depends_on:
       postgres-test:
         condition: service_healthy
       quickwit-test:
         condition: service_healthy
+    volumes:
+      - ./backend:/app
+      - /app/target
     environment:
-      DATABASE_URL: postgres://papercrate:papercrate_test@postgres-test:5432/papercrate_test
+      TEST_DATABASE_URL: postgres://papercrate:papercrate_test@postgres-test:5432/papercrate_test
       DATABASE_MAX_POOL_SIZE: 1
       S3_BUCKET: documents
       JWT_SECRET: change-me-super-secret
       QUICKWIT_ENDPOINT: http://quickwit-test:7280
-    entrypoint: []
+      RUST_LOG: info
     command: >
-      /bin/sh -c "
-        echo 'Running database migrations' &&
-        diesel migration run
+      /bin/bash -c "
+        echo 'Waiting for Postgres...' &&
+        until pg_isready -h postgres-test -U papercrate; do sleep 1; done &&
+        echo 'Running tests...' &&
+        cargo test
       "
-    user: root
-    restart: "no"
 
 volumes:
   quickwit_test_data: