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/81e13f4b2c8942dca536bfe23e2bf1dc/source/manifest.json

@@ -0,0 +1,59 @@
+{
+  "project_uuid": "81e13f4b2c8942dca536bfe23e2bf1dc",
+  "fetched_at": "2026-04-28T17:54:43.521723+00:00",
+  "editor_version": "2.1.34",
+  "boards": [
+    {
+      "sch": "396557787ce44a2fb83d3b6235449b1b",
+      "name": "原版（已验证）",
+      "pcb": "19504c9277084d459f2acd6ab5b234cf"
+    }
+  ],
+  "documents": [
+    {
+      "doc_uuid": "b1601eecf1cd488db0adafb3d15f6523",
+      "docType": 1,
+      "path": "source/b1601eecf1cd488db0adafb3d15f6523.json",
+      "size": 39401,
+      "sha256": "b85b87ebc922ca07fa8dbb00bfa5ab8010e315156dd5ee01fde7783397e279d3"
+    },
+    {
+      "doc_uuid": "db5afc9ff7f04ff7b72448077a3c27b5",
+      "docType": 1,
+      "path": "source/db5afc9ff7f04ff7b72448077a3c27b5.json",
+      "size": 86431,
+      "sha256": "857c94af9c63445460dfc01579079c10bd86f23f5d2de3aed0cb2aa92d1fc004"
+    },
+    {
+      "doc_uuid": "9533dd1a73ef4d3db9699bf1ee6b0b3a",
+      "docType": 1,
+      "path": "source/9533dd1a73ef4d3db9699bf1ee6b0b3a.json",
+      "size": 36078,
+      "sha256": "3387a93980ec1799877afd0ed5a482c44cbf2a22f92dd0678f55c2021e928f61"
+    },
+    {
+      "doc_uuid": "19504c9277084d459f2acd6ab5b234cf",
+      "docType": 3,
+      "path": "source/pcb_19504c9277084d459f2acd6ab5b234cf.json",
+      "size": 191454,
+      "sha256": "bd513a63b11ba9ca01216ef7e4caa97c0f33c77c9a54f0612e4c7bc533321ee9"
+    }
+  ],
+  "structure_summary": {
+    "boards": 1,
+    "schematic_containers": 1,
+    "schematic_sheets": 3,
+    "pcbs": 1,
+    "symbols": 108,
+    "footprints": 134,
+    "devices": 118,
+    "coppers": 9,
+    "textpath": 7,
+    "blobs": 21
+  },
+  "aux": {
+    "coppers_count": 0,
+    "textpath_count": 7,
+    "blobs_count": 21
+  }
+}