fix: 修复生产数据库 schema 同步脚本的双重 IF NOT EXISTS bug

prisma db push 生成的 .schema 已自带 CREATE TABLE IF NOT EXISTS，
旧脚本的 sed 替换会生成 IF NOT EXISTS IF NOT EXISTS 导致 SQL 语法错误，
建表全部静默失败。现在只对 CREATE INDEX 做 IF NOT EXISTS 补充。

docker-entrypoint.sh

@@ -1,14 +1,36 @@
 #!/bin/sh
 set -e
 
+TEMPLATE="/app/template.db"
 DB="/app/data/prod.db"
 
 if [ ! -f "$DB" ]; then
-  echo "[db] First run — initializing database"
+  echo "[db] First run — creating database from template"
+  cp "$TEMPLATE" "$DB"
+  exec node server.js
 fi
 
 echo "[db] Syncing schema..."
-node ./node_modules/prisma/build/index.js db push --skip-generate --accept-data-loss 2>&1
-echo "[db] Schema sync complete"
 
+# Schema already contains "CREATE TABLE IF NOT EXISTS" from Prisma.
+# Only indexes need the IF NOT EXISTS addition.
+sqlite3 "$TEMPLATE" ".schema" | \
+  sed 's/CREATE INDEX /CREATE INDEX IF NOT EXISTS /g' | \
+  sed 's/CREATE UNIQUE INDEX /CREATE UNIQUE INDEX IF NOT EXISTS /g' | \
+  sqlite3 "$DB"
+
+# Add missing columns to existing tables
+for table in $(sqlite3 "$TEMPLATE" "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%' AND name NOT LIKE '_prisma%'"); do
+  prod_cols=$(sqlite3 "$DB" "PRAGMA table_info('$table')" | cut -d'|' -f2)
+
+  sqlite3 "$TEMPLATE" "PRAGMA table_info('$table')" | while IFS='|' read -r _cid name type notnull dflt _pk; do
+    if ! echo "$prod_cols" | grep -qx "$name"; then
+      alter="ALTER TABLE \"$table\" ADD COLUMN \"$name\" $type"
+      [ -n "$dflt" ] && alter="$alter DEFAULT $dflt"
+      sqlite3 "$DB" "$alter" && echo "[db] + $table.$name" || echo "[db] WARN: failed to add $table.$name"
+    fi
+  done
+done
+
+echo "[db] Schema sync complete"
 exec node server.js