feat(iit): Implement real-time quality control system

Summary:

- Add 4 new database tables: iit_field_metadata, iit_qc_logs, iit_record_summary, iit_qc_project_stats

- Implement pg-boss debounce mechanism in WebhookController

- Refactor QC Worker for dual output: QC logs + record summary

- Enhance HardRuleEngine to support form-based rule filtering

- Create QcService for QC data queries

- Optimize ChatService with new intents: query_enrollment, query_qc_status

- Add admin batch operations: one-click full QC + one-click full summary

- Create IIT Admin management module: project config, QC rules, user mapping

Status: Code complete, pending end-to-end testing
Co-authored-by: Cursor <cursoragent@cursor.com>

backend/prisma/migrations/20251208_add_column_mapping/migration.sql

@@ -1,3 +1,22 @@
+-- CreateTable (merged from create_tool_c_session.sql for shadow database compatibility)
+CREATE TABLE IF NOT EXISTS "dc_schema"."dc_tool_c_sessions" (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id VARCHAR(255) NOT NULL,
+  file_name VARCHAR(500) NOT NULL,
+  file_key VARCHAR(500) NOT NULL,
+  total_rows INTEGER NOT NULL,
+  total_cols INTEGER NOT NULL,
+  columns JSONB NOT NULL,
+  encoding VARCHAR(50),
+  file_size INTEGER NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  expires_at TIMESTAMP NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_dc_tool_c_sessions_user_id ON "dc_schema"."dc_tool_c_sessions"(user_id);
+CREATE INDEX IF NOT EXISTS idx_dc_tool_c_sessions_expires_at ON "dc_schema"."dc_tool_c_sessions"(expires_at);
+
 -- AlterTable
 -- 添加 column_mapping 字段到 dc_tool_c_sessions 表
 -- 用于解决表头特殊字符问题