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/ebcaa9ec6f0044548d8b85adb58876b3/_urls.json

@@ -0,0 +1,21 @@
+{
+  "detail_url": "https://oshwhub.com/nevet/fly_main_board",
+  "cover_url": "https://image.lceda.cn/avatars/2022/7/zJXQsgPJ1Q6vB56QuJ2SYBWlTMQwTnlTWdYLYBkw.png",
+  "attachments": [
+    {
+      "name": "小四轴源码.rar",
+      "url": "https://image.lceda.cn/attachments/2022/7/yiByRFuPxVT0XNIBw5cFDaBf3HjKH0C5tljiKL7v.rar",
+      "original_id": "1a87b258d9bc472fb5f660906dedff6d"
+    },
+    {
+      "name": "试飞记录.mp4",
+      "url": "https://image.lceda.cn/attachments/2022/7/iLDsZMqyvDnA3vHyLcWxpqhYFqNd0xKvv7MyS5w6.mp4",
+      "original_id": "64acd31062b6465eb5bb4d75d0ea0ac0"
+    },
+    {
+      "name": "遥控.mp4",
+      "url": "https://image.lceda.cn/attachments/2022/7/5U3UIaoQBXIKPxrKR8lm7BjQTi5RRh2HreP4ybqK.mp4",
+      "original_id": "f67d5be3c2c14a328faa466c030119fb"
+    }
+  ]
+}