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/8f828882c3344e10b37bf0a63cbc4351/_urls.json

@@ -0,0 +1,16 @@
+{
+  "detail_url": "https://oshwhub.com/caisheng/naze32-fei-kong-ban",
+  "cover_url": "https://image.lceda.cn/pullimage/N0N50cU3bum9YicHn3T2WtGZXRZwWXrsRpBOYE29.jpeg",
+  "attachments": [
+    {
+      "name": "betaflight_3.2.5_NAZE.hex",
+      "url": "https://image.lceda.cn/attachments/2020/11/rFwR3Z7PWmVpcY53OdwYsTCESqYpiHee4xW1ppvP.txt",
+      "original_id": "11faf7cb0af4457e8dd72481c20f8991"
+    },
+    {
+      "name": "PID调节方法.txt",
+      "url": "https://image.lceda.cn/attachments/2020/11/n6cYNfkH7GaHxmH2t2gXzENeT18o939Fml83oHSO.txt",
+      "original_id": "3e1322e794c54ce98c572540e738251b"
+    }
+  ]
+}