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/industry/types.rs

@@ -29,7 +29,7 @@ pub struct IndustryListItem {
     pub description: String,
     pub status: String,
     pub source: String,
-    pub keywords_count: i64,
+    pub keywords_count: i32,
     pub created_at: chrono::DateTime<chrono::Utc>,
     pub updated_at: chrono::DateTime<chrono::Utc>,
 }