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/9bf5f7dd40c346d58b2d056b6ea32133/_urls.json

@@ -0,0 +1,16 @@
+{
+  "detail_url": "https://oshwhub.com/HatsuneMikuHD/mwc-kong-xin-bei-fei-kong",
+  "cover_url": "https://image.lceda.cn/avatars/2020/9/V7bA7n35O6SwONoFVCa38fGoQ99TncFd6JzJeGQ0.jpeg",
+  "attachments": [
+    {
+      "name": "MultiWii_2_3(郝峰调试好的有刷四轴固件）.rar",
+      "url": "https://image.lceda.cn/attachments/2020/9/09a9Lw4vVTRLM4Y1VaeWr6nwSFjlDQR1BCfN4KiN.rar",
+      "original_id": "933333eaf7414991bc82055ba16417fe"
+    },
+    {
+      "name": "WMC有刷四轴接线.jpg",
+      "url": "https://image.lceda.cn/attachments/2020/9/dMMFwk20CSFfFnA8Z5oNBlO8kElo7a4o4EDS1Cik.jpeg",
+      "original_id": "789d4c5797ab44cfa3230ccc52da547f"
+    }
+  ]
+}