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/d72f8b540e8946d3bf2a1de764b7fc63/_urls.json

@@ -0,0 +1,16 @@
+{
+  "detail_url": "https://oshwhub.com/vinvaa/elrs-rx-2-4g-pwm",
+  "cover_url": "https://image.lceda.cn/avatars/2022/1/YpmSdDqk1eo1oE2DEFFwtP6riPwm1S0PYZ04l2En.png",
+  "attachments": [
+    {
+      "name": "ELRS-DIY2400-RX-pwm(esp8285芯片+E28M12S).zip",
+      "url": "https://image.lceda.cn/attachments/2022/2/k373erU5POWXmnTnVQkjyzWCR9sb15NHGKYpsf5p.zip",
+      "original_id": "abf977f156eb4722b0b7504f7450c6d6"
+    },
+    {
+      "name": "PCB-elrs-rx-2g4-pwm-pcbWIFI_rev0.html",
+      "url": "https://image.lceda.cn/attachments/2022/2/rACYokOPaGeYIPaIp2Pxd0QEdbNWH47IKJX6Chh1.html",
+      "original_id": "970d552e53e94b89a4126203b162175f"
+    }
+  ]
+}