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/8850482672624280a15fe8e504c2fe5e/metadata.json

@@ -0,0 +1,133 @@
+{
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+  "source_url": "https://oshwhub.com/vyvb/cai-niao-405-fei-kong",
+  "project_id": "8850482672624280a15fe8e504c2fe5e",
+  "title": "菜鸟F405飞控",
+  "description_short": "迷你固定翼F405飞控\n支持蓝牙无线调参,板载512MB黑匣子\n独立USB小板，集成蜂鸣器\n1S独立电源板两路升压供电\n2S-6S独立电源板两路稳压供电\n板载两路LDO",
+  "description_path": "description.md",
+  "author": {
+    "username": "vyvb",
+    "display_name": "一只只吃不睡的猫",
+    "user_id": "1024c9eb4a424e9b84725fdf7ecb63e0"
+  },
+  "license": "Public Domain",
+  "tags": [],
+  "created_at": "2023-08-03T09:31:47.000Z",
+  "updated_at": "2026-04-06T02:14:27.000Z",
+  "published_at": "2023-08-10T01:17:00.000Z",
+  "crawled_at": "2026-04-30T10:49:20.214266+00:00",
+  "metrics": {
+    "likes": 23,
+    "stars": 57,
+    "forks": 75,
+    "views": 5958,
+    "watch": 0,
+    "comments": 21
+  },
+  "cover": {
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