chore: 初始版本提交 - 简化架构 + 轮询改造

- 移除 Motia Streams 实时通信，改用 3 秒轮询
- 简化前端代码，移除冗余组件
- 简化后端架构，准备 FastAPI 重构
- 更新 pixi.toml 环境配置
- 保留 bttoxin_digger_v5_repro 作为参考文档

Co-Authored-By: Claude <noreply@anthropic.com>

jobs/98d5184c-c14c-4313-b453-eab548004553/params.json

@@ -0,0 +1,9 @@
+{
+  "min_identity": 0.8,
+  "min_coverage": 0.6,
+  "allow_unknown_families": false,
+  "require_index_hit": true,
+  "lang": "zh",
+  "filename": "HAN055.fna",
+  "file_size": 6099473
+}

jobs/98d5184c-c14c-4313-b453-eab548004553/task_meta.json

@@ -0,0 +1,15 @@
+{
+  "task_id": "98d5184c-c14c-4313-b453-eab548004553",
+  "status": "failed",
+  "current_stage": "digger",
+  "progress": 5,
+  "submission_time": "2026-01-09T09:20:58.722070",
+  "start_time": null,
+  "completion_time": null,
+  "filename": "HAN055.fna",
+  "file_size": 6099473,
+  "lang": "zh",
+  "error_message": "Error:   × failed to open file `/app/pixi.toml`: No such file or directory (os error\n  │ 2)\n\n",
+  "error_stage": "digger",
+  "token_hash": "92b287de95b3e2dc63a15b8478fae30550b20054c81f4733e4e866f26f259155"
+}