fix(saas): 启动崩溃修复 — config_items 约束 + industry 类型匹配

- db.rs: config_items INSERT ON CONFLICT (id) → (category, key_path) 匹配实际唯一约束
- db.rs: fix_seed_data category 重命名前先删除冲突行，避免唯一约束冲突
- migration/service.rs: seed_default_config_items + sync push INSERT 同步修复 ON CONFLICT
- industry/types.rs: keywords_count i64→i32 匹配 PostgreSQL INT4 列类型

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

crates/zclaw-saas/src/migration/service.rs

@@ -258,7 +258,8 @@ pub async fn seed_default_config_items(db: &PgPool) -> SaasResult<usize> {
             let id = uuid::Uuid::new_v4().to_string();
             sqlx::query(
                 "INSERT INTO config_items (id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at)
-                 VALUES ($1, $2, $3, $4, $5, $6, 'local', $7, false, $8, $8)"
+                 VALUES ($1, $2, $3, $4, $5, $6, 'local', $7, false, $8, $8)
+                 ON CONFLICT (category, key_path) DO NOTHING"
             )
             .bind(&id).bind(category).bind(key_path).bind(value_type)
             .bind(current_value).bind(default_value).bind(description).bind(&now)
@@ -374,7 +375,8 @@ pub async fn sync_config(
                         let category = parts.first().unwrap_or(&"general").to_string();
                         sqlx::query(
                             "INSERT INTO config_items (id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at)
-                             VALUES ($1, $2, $3, 'string', $4, $4, 'local', '客户端推送', false, $5, $5)"
+                             VALUES ($1, $2, $3, 'string', $4, $4, 'local', '客户端推送', false, $5, $5)
+                             ON CONFLICT (category, key_path) DO NOTHING"
                         )
                         .bind(&id).bind(&category).bind(key).bind(val).bind(&now)
                         .execute(db).await?;