batch-50: Step 3-4 source download from Guangzhou — 49/50 ok

Run on dev1 (Guangzhou) for the latency advantage. Walltime 3:41 vs
Singapore-estimated 1-2h (~30x speedup, mostly from image.lceda.cn
RTT going from 263ms to 2.6ms).

Pro 25:  24 ok + 1 fail (Super Dial 7f7565ef11 — Pro 2.x legacy
                          schematic/lists 401, separate cookie-perm issue)
         611 docs, 31 MB total
Std 25:  25 ok, 97 docs, 74 MB total
Combined: 49/50 success, 708 docs, 105 MB new disk usage

--max-source-mb 200 cap was not tripped; the 25 Pro candidates are all
under 10 MB, so the 481 MB X86-board outlier from the original sample
was not representative.

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

data/raw/oshwhub/7e052d660aeb40aa9d47a558dd26175b/metadata.json

@@ -118,5 +118,26 @@
     "public": true,
     "publish": true,
     "skipped_files": []
-  }
+  },
+  "source_format": "easyeda-std",
+  "source_path": "source/",
+  "source_documents": [
+    {
+      "doc_uuid": "0180f833099d44e1b6cab6656940e03c",
+      "docType": 1,
+      "master": "15153ed9ca8a428d984c7150e9597279",
+      "path": "source/0180f833099d44e1b6cab6656940e03c.json",
+      "size": 85402,
+      "sha256": "e4dbf794eb94b4dc2bf372c62daafb4805653ee24dada4c76a35432a7b14f944"
+    },
+    {
+      "doc_uuid": "7c3f84b5f81545e1b0577dd7e8b859d7",
+      "docType": 3,
+      "master": "aecbd9915e2f4156b9c1c6a38fc497f3",
+      "path": "source/7c3f84b5f81545e1b0577dd7e8b859d7.json",
+      "size": 466526,
+      "sha256": "16894874a03f855b2ac517e16fbb0a639baf929cbbeba5d5e317ff291a4e40dd"
+    }
+  ],
+  "editor_version": "6.4.25"
 }