fix(snapshot): DATABASE_URL 改绝对路径，修复 SQLite 每次重建丢数据

Prisma 的 file:./data/snapshot.db 相对于 schema.prisma 所在目录
(/app/prisma/)，实际创建在 /app/prisma/data/snapshot.db，不在
volume 挂载的 /app/data/ 下，导致容器重建后数据丢失。

改为 file:/app/data/snapshot.db 绝对路径，确保 SQLite 存入
volume 挂载目录，数据跨容器持久化。

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

backend/services/docker-compose.2.0-snapshot.yml

@@ -19,7 +19,7 @@ services:
     environment:
       - NODE_ENV=production
       - APP_PORT=3199
-      - DATABASE_URL=file:./data/snapshot.db
+      - DATABASE_URL=file:/app/data/snapshot.db
       # PostgreSQL-2 (备份目标)
       - PG_HOST=postgres-2
       - PG_PORT=5432

backend/services/docker-compose.snapshot.yml

@@ -14,7 +14,7 @@ services:
     environment:
       - NODE_ENV=production
       - APP_PORT=3099
-      - DATABASE_URL=file:./data/snapshot.db
+      - DATABASE_URL=file:/app/data/snapshot.db
       # PostgreSQL (备份目标)
       - PG_HOST=postgres
       - PG_PORT=5432

backend/services/snapshot-service/.env.development

@@ -1,6 +1,7 @@
 NODE_ENV=development
 APP_PORT=3099
 DATABASE_URL="file:./data/snapshot.db"
+# Docker 部署时 docker-compose 覆盖为绝对路径: file:/app/data/snapshot.db
 
 # PostgreSQL (被备份目标)
 PG_HOST=localhost

backend/services/snapshot-service/Dockerfile

@@ -7,7 +7,7 @@ COPY package*.json ./
 RUN npm ci
 
 COPY prisma ./prisma/
-RUN DATABASE_URL="file:./data/snapshot.db" npx prisma generate
+RUN DATABASE_URL="file:/app/data/snapshot.db" npx prisma generate
 
 COPY . .
 RUN npm run build
@@ -36,7 +36,7 @@ COPY package*.json ./
 RUN npm ci --only=production
 
 COPY prisma ./prisma/
-RUN DATABASE_URL="file:./data/snapshot.db" npx prisma generate
+RUN DATABASE_URL="file:/app/data/snapshot.db" npx prisma generate
 
 COPY --from=builder /app/dist ./dist