refactor: 缠论引擎包化与 Web 分层（ECR-001）

将根目录引擎迁入 chanlun/ 并保留兼容 shim；拆分 TF_DF 与 web 服务；
前端模块化；strategies 改用 chanlun 导入；补充 ESS 文档与 golden 回归。

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/TASKS/TASK-001-ECR001.yaml

@@ -0,0 +1,29 @@
+task_id: ECR-001
+role: engineer
+phase: coding
+tool: cursor
+
+input:
+  - docs/PROJECT_PROFILE.md
+  - docs/PROJECT_RULES.md
+  - docs/TECH_STACK.md
+  - docs/ECR/ECR-001-chan-web-restructure.md
+  - docs/ENGINEERING_SPEC/ECR-001-restructure.md
+  - docs/ADR/ADR-001-package-layout.md
+  - docs/HANDOFF/ECR-001-architect-to-engineer.md
+
+output:
+  - chanlun/
+  - root shims
+  - web/services web/api web/config
+  - web/static/js/app/
+  - tests/ + docs/TEST_REPORT + IMPLEMENTATION_REPORT + CHANGELOG
+
+forbidden:
+  - redesign_scope
+  - modify config/ or strategies/
+  - change chan algorithm semantics
+  - break /api/analyze contract
+
+next_agent: reviewer
+notes: "1B+2B; behavior freeze; shim for strategies"