飞控-77: 74 std flight-controller projects ingested

Topic-pull from local listing index (`name OR introduction` contains
飞控). 77 std hits in oshwhub_listing_full.jsonl, minus 2 already
crawled = 75 attempted; 74 OK + 1 hard fail (`m1_mh743_ada_v4`,
listing entry missing `count.like`).

dev1 walltime: Step 1 ~12s, Step 4 ~80s (concurrency=5).
License mix: 65% GPL 3.0, 11% Public Domain, 11% MIT, 4% CC variants.

3 partial dirs (Step 1 KeyError on missing `count.like`) dropped — to
be re-fetched after a follow-up crawler patch makes count fields
defensive against listing-index outliers.

Source backfill 74/74 OK, total +46 MB.

data/raw/oshwhub/5cd6d5e7f3d44e79a072b90b12324b08/_urls.json

@@ -0,0 +1,16 @@
+{
+  "detail_url": "https://oshwhub.com/liguanxi/esp32-fei-kong_copy_copy",
+  "cover_url": "https://image.lceda.cn/pullimage/4reo3Fdn2ck1Xhsns4INael7PBwwCj41kdqbcWDo.jpeg",
+  "attachments": [
+    {
+      "name": "ESP32飞行器演示视频.mp4",
+      "url": "https://image.lceda.cn/attachments/2023/1/MHbsVZjjLjGJpO4Vute0S93fXPDLEZ8YFo57mFYm.mp4",
+      "original_id": "404ad483545f4b9eadc1822238d90b87"
+    },
+    {
+      "name": "Gerber_PCB.zip",
+      "url": "https://image.lceda.cn/attachments/2023/1/9rY21bMBX3bQE6eibBg36js3zgrs7UVvBpvDSCRK.zip",
+      "original_id": "98f2498298574a3898bc4ac59c7bad5f"
+    }
+  ]
+}