main: 增强 Agent Run 调度可靠性与幂等性

- 默认切换 AgentProvider 为 HttpAgentProvider，增强网络请求的容错和重试机制
- 优化 Run 逻辑，支持多场景去重与并发保护
- 添加 Redis 发布失败的日志记录以提升问题排查效率
- 扩展 OpenAPI 规范，新增 Error 和 Run 状态相关模型
- 增强测试覆盖，验证调度策略和重复请求的幂等性
- 增加数据库索引以优化查询性能
- 更新所有相关文档和配置文件

database/migrations/2025_12_18_084344_add_message_payload_expression_indexes.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        DB::statement("CREATE INDEX IF NOT EXISTS messages_payload_run_id_idx ON messages ((payload->>'run_id')) WHERE type IN ('run.status','run.cancel.request','error','agent.message')");
+        DB::statement("CREATE INDEX IF NOT EXISTS messages_payload_trigger_message_id_idx ON messages ((payload->>'trigger_message_id')) WHERE type = 'run.status'");
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        DB::statement('DROP INDEX IF EXISTS messages_payload_run_id_idx');
+        DB::statement('DROP INDEX IF EXISTS messages_payload_trigger_message_id_idx');
+    }
+};