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/b5c7cd3c3758432f909a8eb2f829358f/description.md

@@ -0,0 +1,9 @@
+# 电动涵道飞控公开
+
+某电动涵道飞行器的飞控板
+
+---
+- Source: https://oshwhub.com/littlesunny2001/flycontrol_copy
+- Author: littlesunny2001 (littlesunny2001)
+- License: GPL 3.0
+- Published: 2022-07-06T14:58:25.000Z