feat: chat integration, tenant admin spec, backend chat service, miniprogram updates, DEMO moved to tmp, XCX-TEST removed, migrations & docs

docs/database/ddl/zqyy_app__biz.sql

@@ -1,6 +1,6 @@
 -- =============================================================================
 -- zqyy_app / biz（核心业务表（任务/备注/触发器））
--- 生成日期：2026-03-15
+-- 生成日期：2026-03-20
 -- 来源：测试库（通过脚本自动导出）
 -- =============================================================================
 
@@ -36,6 +36,11 @@ CREATE TABLE biz.ai_conversations (
     site_id bigint NOT NULL,
     source_page character varying(100),
     source_context jsonb,
+    context_type character varying(20),
+    context_id character varying(50),
+    title character varying(200),
+    last_message text,
+    last_message_at timestamp with time zone,
     created_at timestamp with time zone DEFAULT now() NOT NULL
 );
 
@@ -45,6 +50,7 @@ CREATE TABLE biz.ai_messages (
     role character varying(10) NOT NULL,
     content text NOT NULL,
     tokens_used integer,
+    reference_card jsonb,
     created_at timestamp with time zone DEFAULT now() NOT NULL
 );
 
@@ -127,6 +133,8 @@ CREATE INDEX idx_ai_cache_cleanup ON biz.ai_cache USING btree (cache_type, site_
 CREATE INDEX idx_ai_cache_lookup ON biz.ai_cache USING btree (cache_type, site_id, target_id, created_at DESC);
 CREATE INDEX idx_ai_conv_app_site ON biz.ai_conversations USING btree (app_id, site_id, created_at DESC);
 CREATE INDEX idx_ai_conv_user_site ON biz.ai_conversations USING btree (user_id, site_id, created_at DESC);
+CREATE INDEX idx_ai_conv_context ON biz.ai_conversations USING btree (user_id, site_id, context_type, context_id, last_message_at DESC NULLS LAST) WHERE (context_type IS NOT NULL);
+CREATE INDEX idx_ai_conv_last_msg ON biz.ai_conversations USING btree (user_id, site_id, last_message_at DESC NULLS LAST);
 CREATE INDEX idx_ai_msg_conv ON biz.ai_messages USING btree (conversation_id, created_at);
 CREATE INDEX idx_coach_tasks_assistant_status ON biz.coach_tasks USING btree (site_id, assistant_id, status);
 CREATE UNIQUE INDEX idx_coach_tasks_site_assistant_member_type ON biz.coach_tasks USING btree (site_id, assistant_id, member_id, task_type) WHERE ((status)::text = 'active'::text);