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/1b09581d66d34438a1e6513e457e0532/metadata.json

@@ -0,0 +1,63 @@
+{
+  "source": "oshwhub",
+  "source_url": "https://oshwhub.com/wesd/h7b0-re-cheng-xiang",
+  "project_id": "1b09581d66d34438a1e6513e457e0532",
+  "title": "手持红外热成像",
+  "description_short": "MLX90640+STM32H7B0的红外热成像，外加一颗ov7670摄像头做辅助显示，最高可做到32HZ的刷新率。",
+  "description_path": "description.md",
+  "author": {
+    "username": "wesd",
+    "display_name": "wesd",
+    "user_id": "b3f7b33189a14088aa30416e034eca7f"
+  },
+  "license": "CERN Open Hardware License",
+  "tags": [],
+  "created_at": "2022-09-06T13:54:54.000Z",
+  "updated_at": "2025-07-16T04:50:13.000Z",
+  "published_at": "2023-11-08T01:25:18.000Z",
+  "crawled_at": "2026-04-23T11:31:34.277837+00:00",
+  "metrics": {
+    "likes": 247,
+    "stars": 646,
+    "forks": 175,
+    "views": 73081,
+    "watch": 0,
+    "comments": 266
+  },
+  "cover": {
+    "url": "https://image.lceda.cn/pullimage/t7auihPq2yo15qct0rCwUXUdBubfIkMhOd1UqaJ1.jpeg",
+    "path": "cover.jpeg"
+  },
+  "files": [
+    {
+      "name": "1.zip",
+      "url": "https://image.lceda.cn/attachments/2022/10/aWLQlbeyYn7SOVykc2x9OWuHpCi5TpXJZfzuQVXS.zip",
+      "original_id": "ad6720dbc62a4152aa6267e24621a700",
+      "ext": "zip",
+      "mime": "application/x-zip-compressed",
+      "size": 524804,
+      "md5": "7b5d94829be2e562228791a3ce9041ec",
+      "path": "files/1.zip",
+      "sha256": "9210315e8660a91932567dafac2959fc31f20bb05e8992363bad44d422144f1d"
+    },
+    {
+      "name": "H7B0_IRCAM.rar",
+      "url": "https://image.lceda.cn/attachments/2023/11/40UrslRfPUk0LUDL5UzA1d8QLzSKrn8lZS41hpxk.rar",
+      "original_id": "516214a3934d43e1a8395923f923a777",
+      "ext": "rar",
+      "mime": "application/octet-stream",
+      "size": 2968329,
+      "md5": "ba10570948bc2e24abb66bce0b7231e0",
+      "path": "files/H7B0_IRCAM.rar",
+      "sha256": "c6de1749d1fc88b637d06dced7e6da14610c5f44c3879bdbbbb5c66f73b81652"
+    }
+  ],
+  "raw_fields": {
+    "path": "wesd/h7b0-re-cheng-xiang",
+    "grade": 4,
+    "origin": "std",
+    "public": true,
+    "publish": true,
+    "skipped_files": []
+  }
+}