新增：event loop 软件包 (#1984)

* event loop 软件包

* fix: 修改json语法错误

* fix: 修复Version 错误

Author: sillysg5110

system/event_loop/Kconfig

@@ -0,0 +1,56 @@
+
+# Kconfig file for package event_loop
+menuconfig PKG_USING_EVENT_LOOP
+    bool "Event loop (delayed dispatch: mq + soft one-shot timer)"
+    default n
+    select RT_USING_MESSAGEQUEUE
+    select RT_USING_MUTEX
+    select RT_USING_TIMER_SOFT
+    help
+        Delay table processing runs only in the soft-timer callback (system timer thread):
+        RT_TIMER_FLAG_ONE_SHOT | RT_TIMER_FLAG_SOFT_TIMER. No extra el_tmr worker thread.
+        Public API: evt_loop_push_delayed / evt_loop_remove_delayed and
+        macros EVT_LOOP_PUSH, EVT_LOOP_REMOVE, EVT_LOOP_REMOVE_WITH_ARGS.
+
+if PKG_USING_EVENT_LOOP
+
+    config PKG_EVENT_LOOP_PATH
+        string
+        default "/packages/system/event_loop"
+
+    config EVENT_LOOP_MAX_EVENT_CNT
+        int "Maximum delayed slots in table"
+        default 32
+        help
+          Fixed table size for pending delayed events.
+
+    config EVENT_LOOP_MSGQ_DEPTH
+        int "Message queue depth (immediate + due callbacks)"
+        default 15
+        help
+          rt_mq capacity for evt_loop_handle_t messages.
+
+    config EVENT_LOOP_THREAD_STACK_SIZE
+        int "Event loop thread stack size (bytes)"
+        default 3072
+
+    config EVENT_LOOP_THREAD_PRIORITY
+        int "Event loop thread priority (smaller = higher)"
+        default 12
+        range 0 31
+        help
+          Must be strictly greater than RT_TIMER_THREAD_PRIO in rtconfig.h so the
+          soft-timer daemon (lower number) preempts evt_loop. Example: timer prio 4,
+          use 12 here.
+
+    config EVENT_LOOP_USING_SAMPLES
+        bool "Build event_loop sample (event_loop_test.c)"
+        default n
+        help
+          Registers MSH command event_loop_test (when FINSH enabled).
+
+    config PKG_EVENT_LOOP_VER
+       string
+       default "latest"
+
+endif

system/event_loop/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "event_loop",
+  "description": "RT-Thread event loop: delayed callback dispatch (message queue + soft timer)",
+  "description_zh": "RT-Thread 事件循环：消息队列与软定时器实现延迟回调执行",
+  "enable": "PKG_USING_EVENT_LOOP",
+  "keywords": [
+    "event",
+    "loop"
+  ],
+  "category": "system",
+  "author": {
+    "name": "John.liu",
+    "email": "450547566@qq.com",
+    "github": "https://github.com/Bluetooth-BLE"
+  },
+  "license": "Apache-2.0",
+  "repository": "https://github.com/Bluetooth-BLE/event_loop",
+  "icon": "unknown",
+  "homepage": "https://github.com/Bluetooth-BLE/event_loop#readme",
+  "doc": "unknown",
+  "site": [
+    {
+      "version": "latest",
+      "URL": "https://github.com/Bluetooth-BLE/event_loop.git",
+      "filename": "",
+      "VER_SHA": "main"
+    }
+  ]
+}