Phase 1 MVP: crawl 10 high-quality oshwhub projects into LFS

Why:
- Charles 指定：先爬 10 个高质量项目存 Gitea LFS，一个项目一个文件夹，
  保留原文件和 URL。先以小批量验证 schema + LFS 流水线，放量前再拍板
  存储规模。

What:
- crawlers/oshwhub: 列表 API (`/api/project?sort=hot`) + SSR HTML 解析，
  一次性产出 metadata / description / cover / files / _urls
- schemas/project.schema.json: 跨源统一 schema
- docs/sources/oshwhub.md: API 入口 / 字段映射 / 陷阱调研
- pyproject.toml: httpx[http2] 单依赖
- .gitattributes: data/raw/**/files/** 一律走 LFS（规则写窄，避免误伤 schemas/*.json 等）
- .gitignore: 移除 data/raw/* 排除（改走 LFS 入库）

10 个项目覆盖：调试器 / 加热台 / 盖革计数器 / 数控电源 / 焊台 /
智能手表 / USB 测电流 / ZVS 感应加热 / AI 开发板 / 红外热成像。
共 52 附件 ≈ 524 MB 入 LFS，筛选判据 grade=4 & likes>=100 & 多样性。

Known gaps（见 plan.md § Phase 1.4）：
- EasyEDA 源 JSON 需登录 (u.lceda.cn)，v0.1 跳过
- fs-web-stream.jlc.com 的工程源下载未测
- scripts/validate.py 自动 schema 校验未实现

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

data/raw/oshwhub/3e2f893d74664e01b755ccf2582792de/_urls.json

@@ -0,0 +1,41 @@
+{
+  "detail_url": "https://oshwhub.com/mojinyinhu/t12858-tong-yong-han-tai",
+  "cover_url": "https://image.lceda.cn/pullimage/X7qQwpTwtIeTBm2FkJfDZCo0K0tv4ZyyQCrgYJGQ.jpeg",
+  "attachments": [
+    {
+      "name": "F1-T12-858D-master4.07.zip",
+      "url": "https://image.lceda.cn/attachments/2022/4/jxFVtEW6XG1wB6AjK8ykfSwqUVDV9OpKiaHqqb51.zip",
+      "original_id": "456c6c6a13b64483be969f93637e7255"
+    },
+    {
+      "name": "固件在解压缩后在BINARY文件夹，选取适合自己屏幕固件烧录.txt",
+      "url": "https://image.lceda.cn/attachments/2022/4/GREMfysm2sIMw6hOBfAwTvzjMdCPXCTAz5oq1jpd.txt",
+      "original_id": "f25fdd81e5134335a2f56b39da71c501"
+    },
+    {
+      "name": "校准.txt",
+      "url": "https://image.lceda.cn/attachments/2022/4/TBGObPjIQG0Z7h9bBrfZdZRKqdfgC9hAiCtaU6G7.txt",
+      "original_id": "4d9c148dafc64ad6b27dbefed3e8ec2e"
+    },
+    {
+      "name": "F1_T12+858D编译视频教程.rar",
+      "url": "https://image.lceda.cn/attachments/2022/4/oIV5aPj2dyXrwODr0PpF9VH16w98TuJmggWB3lJ4.rar",
+      "original_id": "70d67505c93242a4a3bc7fb91fa7c80d"
+    },
+    {
+      "name": "T12+858焊台BOM表.xlsx",
+      "url": "https://image.lceda.cn/attachments/2022/6/y6f0JXE1jHDbcoMVx9prMqU1VQODyNyCggeZFRY3.xlsx",
+      "original_id": "be2b2cce0ee24fe8838805cacd53ccd0"
+    },
+    {
+      "name": "PCB_小板合一拼版（二层板）自行导入力创导出gerber.json",
+      "url": "https://image.lceda.cn/attachments/2022/6/BMkqLsDhiJo2t8op8Ejvwwc8TaKqaooxSzg8a4rQ.txt",
+      "original_id": "eaba63442d404070b930639390eef369"
+    },
+    {
+      "name": "PCB_功率板+控制板（四层板）自行导入力创导出_2022-08-21.json",
+      "url": "https://image.lceda.cn/attachments/2022/8/4LRvXx6WH6DD8V8GPZQEegxSCThDMkr1w4qbe1FT.txt",
+      "original_id": "ae9d73994d534fd499a456fd9d2f7b40"
+    }
+  ]
+}