feat: add Prism snake and gameplay database lifecycle

- Add bitboard-accelerated Prism and versioned Supreme snake implementations.
- Add database-backed move benchmarks and focused strategy tests.
- Normalize gameplay storage while preserving replay compatibility.
- Add deterministic game quality scoring and replay retention tiers.
- Add backup-first SQLite cleanup, verification, and replacement tooling.
- Add safe compact-plus-delta database merging with conflict detection.
- Extend SQLite and PostgreSQL schemas for replay and quality metadata.
- Add PostgreSQL development service and pytest import configuration.
- Update gameplay documentation and the quart_common submodule revision.

docker-compose.yml

@@ -1,17 +1,38 @@
 services:
-  battlesnake:
-    image: daniel156161/battlesnake
-    container_name: battlesnake
-    ports:
-      - 8000:8000
-    volumes:
-      - ${DOCKER_DATA_PATH}:/app/data
-    build:
-      context: ./
-      dockerfile: Dockerfile
-    #environment:
-    #  - SNAKE_COLOR=blue
-    #  - SNAKE_HEAD=caffeine
-    #  - SNAKE_TAIL=mlh-gene
-    #  - STORE_GAME_HISTORY=True
+  # battlesnake:
+  #   image: daniel156161/battlesnake
+  #   container_name: battlesnake
+  #   ports:
+  #     - 8000:8000
+  #   volumes:
+  #     - ${DOCKER_DATA_PATH}:/app/data
+  #   build:
+  #     context: ./
+  #     dockerfile: Dockerfile
+  #   #environment:
+  #   #  - SNAKE_COLOR=blue
+  #   #  - SNAKE_HEAD=caffeine
+  #   #  - SNAKE_TAIL=mlh-gene
+  #   #  - STORE_GAME_HISTORY=True
+  #   restart: always
+
+  postgres:
     restart: always
+    image: postgres:18-alpine
+    container_name: postgres
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER}"]
+      start_period: 20s
+      interval: 30s
+      retries: 10
+      timeout: 5s
+    ports:
+      - "5433:5432"
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+
+      PUID: 1000
+      PGID: 1001
+    volumes:
+      - ${DOCKER_DATA_PATH}/postgres:/var/lib/postgresql