fix(api): 修復全部 lint 錯誤 (ruff --fix)

- Import sorting (I001)
- Unused imports (F401)
- f-string without placeholders (F541)
- Loop variable unused (B007)
- zip() strict parameter (B905)
- Exception chaining (B904)
- collections.abc imports (UP035)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/migrations/phase18_audit_log_failure_loop.sql

@@ -0,0 +1,55 @@
+-- =============================================================================
+-- Phase 18: 失敗自動修復閉環 - AuditLog 表擴展
+-- =============================================================================
+-- 執行日期: 2026-03-26
+-- 執行者: 首席架構師
+-- ADR: ADR-023-failure-auto-repair-loop.md
+-- =============================================================================
+
+-- 新增授權來源追蹤欄位
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS authorization_channel VARCHAR(20);
+
+COMMENT ON COLUMN audit_logs.authorization_channel IS 'Authorization source: web, telegram, auto';
+
+-- 新增重試與修復追蹤欄位
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS retry_count INTEGER DEFAULT 0 NOT NULL;
+
+COMMENT ON COLUMN audit_logs.retry_count IS 'Number of retry attempts';
+
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS failure_classification VARCHAR(50);
+
+COMMENT ON COLUMN audit_logs.failure_classification IS 'Failure type: TIMEOUT, K8S_ERROR, NETWORK_ERROR, PERMISSION_DENIED';
+
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS source_approval_id VARCHAR(36);
+
+COMMENT ON COLUMN audit_logs.source_approval_id IS 'Original approval ID if this is a repair attempt';
+
+-- 新增自動修復狀態欄位
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS auto_repair_attempted BOOLEAN DEFAULT FALSE NOT NULL;
+
+COMMENT ON COLUMN audit_logs.auto_repair_attempted IS 'Whether auto-repair was attempted';
+
+ALTER TABLE audit_logs
+ADD COLUMN IF NOT EXISTS auto_repair_result TEXT;
+
+COMMENT ON COLUMN audit_logs.auto_repair_result IS 'Auto-repair result: AI analysis and repair outcome';
+
+-- 建立索引
+CREATE INDEX IF NOT EXISTS ix_audit_authorization_channel ON audit_logs(authorization_channel);
+CREATE INDEX IF NOT EXISTS ix_audit_failure_classification ON audit_logs(failure_classification);
+CREATE INDEX IF NOT EXISTS ix_audit_source_approval_id ON audit_logs(source_approval_id);
+
+-- =============================================================================
+-- 驗證
+-- =============================================================================
+-- 執行以下查詢確認欄位已建立:
+-- SELECT column_name, data_type, is_nullable
+-- FROM information_schema.columns
+-- WHERE table_name = 'audit_logs'
+-- AND column_name IN ('authorization_channel', 'retry_count', 'failure_classification',
+--                     'source_approval_id', 'auto_repair_attempted', 'auto_repair_result');