feat(launcher): 应用列表热重载 — 2s 轮询比对 MeowAPPs 目录签名(自身+各应用目录 mtime FNV 混合)，变化即重扫刷新；常驻主界面推新包约 2s 内出现，不再需重启

patch_v2/meow_launcherd/main_menu.c

@@ -273,6 +273,32 @@ static int sim_exit_tap_done = 0;
 
 
 /* real menu loop */
+/* M2.77 应用列表热重载：MeowAPPs 目录签名（自身 + 各应用目录 mtime 的 FNV 混合），
+ * run_menu 2s 轮询比对，变化即重扫——覆盖 SSH/面板推新包、删包、应用目录内容变动等场景
+ * （此前仅「无卡→有卡」过渡才重扫，常驻主界面下推包不刷新）。 */
+static unsigned long long apps_dir_sig(void)
+{
+    unsigned long long sig = 1469598103934665603ULL;   /* FNV-1a offset */
+    struct stat st;
+    if (stat(MEOWAPPS, &st) != 0) return 0;
+    sig ^= (unsigned long long)st.st_mtime; sig *= 1099511628211ULL;
+    DIR *d = opendir(MEOWAPPS);
+    if (d) {
+        struct dirent *de;
+        while ((de = readdir(d))) {
+            if (de->d_name[0] == '.') continue;
+            char p[300];
+            snprintf(p, sizeof p, "%s/%s", MEOWAPPS, de->d_name);
+            if (stat(p, &st) == 0 && S_ISDIR(st.st_mode)) {
+                sig ^= (unsigned long long)st.st_mtime * 256 + (unsigned char)de->d_name[0];
+                sig *= 1099511628211ULL;
+            }
+        }
+        closedir(d);
+    }
+    return sig;
+}
+
 static void run_menu(struct app apps[MAX_APPS], int napps, int state,
                      long sim_tap_ms, long sim_exit_ms)
 {
@@ -289,6 +315,7 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
     int had_player = 0;              /* M2.2：菜单打开时是否存在存活播放器 */
     long sim_tap_done = 0, sim_exit_done = 0;
     long meow_last_poll = 0;         /* M2.2：MeowOS 后台拔营（卡/网）轮询时间戳 */
+    unsigned long long apps_sig = 0; /* M2.77：应用目录签名（0=未初始化，首圈建立基线） */
 
     load_config();   /* meow.conf on the card: bg_color etc. */
 
@@ -502,6 +529,28 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
                 }
                 g_sys.sd_mounted = 1;
                 log_poll_card();
+                /* M2.77 应用列表热重载：目录签名变化（推新包/删包/应用目录变动）→ 重扫刷新。
+                 * 与上面「无卡→有卡」过渡重扫互补：常驻主界面下目录内容变化也覆盖。 */
+                {
+                    unsigned long long asig = apps_dir_sig();
+                    if (apps_sig && asig && asig != apps_sig) {
+                        struct app fresh[MAX_APPS];
+                        int fn = scan_apps(fresh);
+                        int fstate = (fn < 0) ? (fn == -1 ? 1 : 2) : (fn == 0 ? 2 : 0);
+                        if (fstate == 0 && fn > 0) {
+                            memcpy(apps, fresh, sizeof fresh);
+                            napps = fn; state = 0;
+                            if (cursor >= napps) cursor = napps - 1;
+                            dirty = 1;
+                            logmsg("hot-reload: MeowAPPs changed -> %d apps", napps);
+                        } else if (fstate != state) {
+                            state = fstate; napps = (fn > 0) ? fn : 0;
+                            dirty = 1;
+                            logmsg("hot-reload: state -> %d", state);
+                        }
+                    }
+                    apps_sig = asig;
+                }
             } else if (!sd_mounted()) {
                 /* 卡在但未挂载（正挂载/失败）：保持当前显示不误判；不崩。 */
                 g_sys.sd_mounted = 0;