feat: M6.10–M6.19 批量收编 + M6.19 推卡验收

- M7 launcher 重写 5 期（虚拟化宫格/meow_theme 单一权威/横幅动画/自定义 PIN 键盘）
- OOM 通用化（cachegov 上收 SDK）、自动切歌根治、meowpanel jv_free 泄漏修复、Hello 滚动卡顿修复
- ncm 歌词 UI / 媒体通知封面 / 封面分辨率 640
- 5 bug 修复：ncm 后台化 UI 叠层+点击穿透、再进 ncm 桌面叠层、播放页新旧 UI 叠层抢刷脏区（meow_ui_gfx 恢复边沿整帧重画）、PIN 亮屏亮度跳（keys.c meow_panel_on 按 settings_brightness_clamped 恢复）、通知中心封面显歌单封面（cover.c save_cover_raw 加 is_song + 命中块守卫）
- 四 App 统一重链新 meow_ui.a 51caee4a；M6.19=0.8.19 固件 2d2331f2 推卡自刷验收全绿

patch_v2/reader_app/test/test_reader_core.c

@@ -266,10 +266,66 @@ static void t10(void)
     remove(path);
 }
 
+/* t11 — Big5→UTF-8 解码金标准（R3：big5_2byte 码表；对照 python `big5` codec）。 */
+static void t11(void)
+{
+    /* "你好世界" Big5 = a741 a66e a540 acc9 → UTF-8 你好世界 */
+    const uint8_t in_nihao[] = { 0xA7, 0x41, 0xA6, 0x6E, 0xA5, 0x40, 0xAC, 0xC9 };
+    const uint8_t ex_nihao[] = "\xE4\xBD\xA0\xE5\xA5\xBD\xE4\xB8\x96\xE7\x95\x8C";
+    uint8_t out[256]; size_t olen = 0;
+    int rc = rd_big5_to_utf8(in_nihao, sizeof in_nihao, out, sizeof out, &olen);
+    CHECK(rc == RD_ENC_OK, "big5 decode ok");
+    CHECK(olen == sizeof ex_nihao - 1 && memcmp(out, ex_nihao, olen) == 0, "big5 golden 你好世界");
+    /* 经通用 rd_to_utf8(RD_ENC_BIG5) 路径 */
+    memset(out, 0, sizeof out); olen = 0;
+    CHECK(rd_to_utf8(RD_ENC_BIG5, in_nihao, sizeof in_nihao, out, sizeof out, &olen) == RD_ENC_OK &&
+          olen == sizeof ex_nihao - 1 && memcmp(out, ex_nihao, olen) == 0, "rd_to_utf8 big5");
+
+    /* 繁体长句（python 生成金标准） */
+    const uint8_t in_tr[] = { 0xB3,0x6F,0xAC,0x4F,0xC1,0x63,0xC5,0xE9,0xA4,0xA4,0xA4,0xE5,0xB4,0xFA,
+                              0xB8,0xD5,0xA1,0x41,0xA5,0xCE,0xA9,0xF3,0xBD,0x73,0xBD,0x58,0xC0,0xCB,
+                              0xB4,0xFA,0xA1,0x43 };
+    const uint8_t ex_tr[] = "\xE9\x80\x99\xE6\x98\xAF\xE7\xB9\x81\xE9\xAB\x94\xE4\xB8\xAD\xE6\x96\x87"
+                            "\xE6\xB8\xAC\xE8\xA9\xA6\xEF\xBC\x8C\xE7\x94\xA8\xE6\x96\xBC\xE7\xB7\xA8"
+                            "\xE7\xA2\xBC\xE6\xAA\xA2\xE6\xB8\xAC\xE3\x80\x82";
+    memset(out, 0, sizeof out); olen = 0;
+    CHECK(rd_big5_to_utf8(in_tr, sizeof in_tr, out, sizeof out, &olen) == RD_ENC_OK, "big5 trad decode");
+    CHECK(olen == sizeof ex_tr - 1 && memcmp(out, ex_tr, olen) == 0, "big5 golden trad");
+
+    /* 非法 Big5 双字节（trail 0x80..0xA0 非 Big5 尾节区）→ U+FFFD，不崩溃 */
+    const uint8_t in_bad[] = { 0xA7, 0x80, 'X' };   /* a7 + trail 0x80（Big5 非法）+ 孤立 0x80 */
+    memset(out, 0, sizeof out); olen = 0;
+    CHECK(rd_big5_to_utf8(in_bad, sizeof in_bad, out, sizeof out, &olen) == RD_ENC_OK, "big5 bad decode");
+    const uint8_t ex_bad[] = { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 'X' };  /* FFFD(0xA7) FFFD(0x80) X */
+    CHECK(olen == sizeof ex_bad && memcmp(out, ex_bad, olen) == 0, "big5 bad → FFFD");
+}
+
+/* t12 — Big5 文件经 rdtxt 段读（info.enc 显式 Big5，模拟 UI 编码切换）。 */
+static void t12(void)
+{
+    const char *path = "/tmp/rdtxt_big5.txt";
+    FILE *f = fopen(path, "wb");
+    const uint8_t b5[] = { 0xA7,0x41,0xA6,0x6E, 0x0A, 0xA5,0x40,0xAC,0xC9, 0x0A };  /* 你好\n世界\n */
+    fwrite(b5, 1, sizeof b5, f);
+    fclose(f);
+    rdtxt_info info;
+    CHECK(rdtxt_probe(path, &info) == 0, "big5 probe");
+    info.enc = RD_ENC_BIG5;   /* 手动指定 Big5（auto 会判 GB18030） */
+    rdtxt_reader *r = NULL;
+    CHECK(rdtxt_reader_open(path, &info, &r) == 0, "big5 open");
+    uint8_t buf[RDTXT_SEG_UTF8_MAX + 8];
+    size_t ul = 0, off = 0, flen = 0, total = 0;
+    while (rdtxt_reader_next(r, buf, sizeof buf, &ul, &off, &flen) == 0) total += ul;
+    rdtxt_reader_free(r);
+    /* 整文件为一段（< 48K 分段阈值）："你好\n世界\n" = 6+1+6+1 = 14 字节 */
+    CHECK(total == 14, "big5 segments sum");
+    remove(path);
+}
+
 int main(void)
 {
     t1(); t2(); t3(); t4(); t5();
-    t6(); t7(); t8(); t9(); t10();
+    t6(); t7(); t8(); t9(); t10(); t11(); t12();
     printf("test_reader_core: %d pass, %d fail\n", g_pass, g_fail);
     return g_fail ? 1 : 0;
 }