feat: 新增项目中心——按项目组织任务/任务群/总群并一键推送

- 新表 projects / project_group_chats，partners 加 partner_type/wecom_userid，tasks 加 project_id（迁移 0010）
- 项目 CRUD、总群成员配置、任务群人工映射（群主→合作方）、任务挂项目
- 推送：总群成员逐人应用消息 + 任务群按群主企业群发，结果分项回显

mysql/0010_projects_and_partner_type.sql

@@ -0,0 +1,27 @@
+CREATE TABLE IF NOT EXISTS `projects` (
+  `id` VARCHAR(64) NOT NULL,
+  `name` VARCHAR(255) NOT NULL,
+  `brand` VARCHAR(255) NOT NULL DEFAULT '',
+  `main_group_member_ids` TEXT NOT NULL,
+  `status` VARCHAR(32) NOT NULL DEFAULT 'active',
+  `note` TEXT NOT NULL,
+  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+-- statement-breakpoint
+CREATE TABLE IF NOT EXISTS `project_group_chats` (
+  `id` VARCHAR(64) NOT NULL,
+  `project_id` VARCHAR(64) NOT NULL,
+  `chat_id` VARCHAR(128) NOT NULL,
+  `partner_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `project_group_chats_uniq` (`project_id`,`chat_id`),
+  KEY `project_group_chats_project_idx` (`project_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+-- statement-breakpoint
+ALTER TABLE `partners` ADD COLUMN `partner_type` VARCHAR(32) NOT NULL DEFAULT 'external_koc';
+-- statement-breakpoint
+ALTER TABLE `partners` ADD COLUMN `wecom_userid` VARCHAR(128) NOT NULL DEFAULT '';
+-- statement-breakpoint
+ALTER TABLE `tasks` ADD COLUMN `project_id` VARCHAR(64) NOT NULL DEFAULT '';