refactor: 迁移至 bashly CLI 与功能域模块结构

- CLI 定义迁移至 src/bashly.yml（bashly 1.4 生成参数解析），入口收敛为 src/root_command.sh
- 源码按功能域重组：config/storage/integrate/media/pipeline，消除扁平散落
- 新增零依赖测试框架 tests/（123 用例）与 CI 流水线（lint + test + build + 产物一致性）
- build.sh 支持版本单一来源注入与 --check 产物校验；新增 lint.sh（bash -n + shellcheck 零容忍）
- 删除旧单文件 media_organizer.sh 与旧扁平模块

tests/cases/storage/ledger.sh

@@ -0,0 +1,96 @@
+# ============================================================================
+# 账本与冷却模块测试（src/lib/ledger.sh）
+# ============================================================================
+
+setup() {
+  TEST_DIR="$(mktemp -d)"
+  CACHE_DIR="$TEST_DIR/cache"
+  DRY_RUN=false
+  FAIL_RETRY_COOLDOWN_HOURS=1
+  LEDGER_LINKED=()
+  LEDGER_INODE=()
+  COOLDOWN_MAP=()
+  CORRECTIONS_MAP=()
+}
+
+teardown() {
+  rm -rf "$TEST_DIR"
+}
+
+# ledger_mark_linked + ledger_is_linked：标记后判定已链接
+test_ledger_mark_and_is_linked() {
+  local src="$TEST_DIR/a.mkv" dest="$TEST_DIR/dest/a.mkv"
+  mkdir -p "$TEST_DIR/dest"
+  echo data >"$src"
+  ln "$src" "$dest"
+  ledger_mark_linked "$src" "$dest"
+  assert_success ledger_is_linked "$src"
+}
+
+# ledger_is_linked：目标被删 → 失效（重新识别）
+test_ledger_is_linked_invalid_when_dest_deleted() {
+  local src="$TEST_DIR/a.mkv" dest="$TEST_DIR/dest/a.mkv"
+  mkdir -p "$TEST_DIR/dest"
+  echo data >"$src"
+  ln "$src" "$dest"
+  ledger_mark_linked "$src" "$dest"
+  rm -f "$dest"
+  assert_failure ledger_is_linked "$src"
+}
+
+# ledger_is_linked：未标记 → 未链接
+test_ledger_is_linked_unmarked() {
+  local src="$TEST_DIR/a.mkv"
+  echo data >"$src"
+  assert_failure ledger_is_linked "$src"
+}
+
+# cooldown_set + cooldown_active：冷却期内判定
+test_cooldown_set_and_active() {
+  local src="$TEST_DIR/a.mkv"
+  echo data >"$src"
+  cooldown_set "$src" "request_failed"
+  assert_success cooldown_active "$src"
+}
+
+# cooldown_active：源文件消失 → 不冷却（允许重试）
+test_cooldown_inactive_when_src_gone() {
+  local src="$TEST_DIR/a.mkv"
+  echo data >"$src"
+  cooldown_set "$src" "request_failed"
+  rm -f "$src"
+  assert_failure cooldown_active "$src"
+}
+
+# cooldown_active：过期 → 不冷却
+test_cooldown_inactive_when_expired() {
+  local src="$TEST_DIR/a.mkv"
+  echo data >"$src"
+  COOLDOWN_MAP["$src"]=$(($(date +%s) - 10))
+  assert_failure cooldown_active "$src"
+}
+
+# ledger_flush：落盘 linked.json 并可重新加载
+test_ledger_flush_roundtrip() {
+  local src="$TEST_DIR/a.mkv" dest="$TEST_DIR/dest/a.mkv"
+  mkdir -p "$TEST_DIR/dest"
+  echo data >"$src"
+  ln "$src" "$dest"
+  ledger_mark_linked "$src" "$dest"
+  ledger_flush
+  assert_file_exists "$CACHE_DIR/media_organizer/linked.json"
+  LEDGER_LINKED=()
+  LEDGER_INODE=()
+  ledger_load
+  assert_success ledger_is_linked "$src"
+}
+
+# ledger_flush：干运行零持久化副作用
+test_ledger_flush_skipped_in_dry_run() {
+  local src="$TEST_DIR/a.mkv"
+  echo data >"$src"
+  ledger_mark_linked "$src" "$TEST_DIR/dest.mkv"
+  DRY_RUN=true
+  ledger_flush
+  assert_file_absent "$CACHE_DIR/media_organizer/linked.json"
+}