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

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+# ============================================================================
+# CI：静态检查 → 单元测试 → 构建一致性
+# 触发：push / pull_request（默认分支与 PR）
+# ============================================================================
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  quality:
+    name: lint + test + build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install shellcheck
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
+
+      - name: Setup Ruby (bashly)
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.4'
+
+      - name: Install bashly
+        run: gem install bashly
+
+      - name: Lint (bash -n + shellcheck)
+        run: ./lint.sh
+
+      - name: Unit tests
+        run: ./tests/run.sh
+
+      - name: Build
+        run: ./build.sh
+
+      - name: Verify artifact freshness
+        run: ./build.sh --check