feat(imports): add real pricing and subscription collectors

Add plan catalog and subscription schema support, seed baselines, and real importers for core domestic subscriptions plus stable official pricing sources.

This commit also hardens the shared fetch layers so the importers can support live collection and database writes instead of relying on manual placeholders alone.

scripts/testdata/minimax_token_plan_sample.txt

@@ -0,0 +1,48 @@
+更新时间: 2026-05-15
+Monthly Token Plans
+Standard Plans:
+Starter Plus Max
+Price
+$10 /month
+$20 /month
+$50 /month
+M2.7
+1,500 requests/5hrs
+4,500 requests/5hrs
+15,000 requests/5hrs
+Highspeed Plans:
+Plus-Highspeed Max-Highspeed Ultra-Highspeed
+Price
+$40 /month
+$80 /month
+$150 /month
+M2.7-highspeed
+4,500 requests/5hrs
+15,000 requests/5hrs
+30,000 requests/5hrs
+Speech 2.8 4000 chars/day 11000 chars/day
+image-01 50 images/day 120 images/day
+Hailuo 2.3-Fast 2 videos/day
+Hailuo 2.3 2 videos/day
+Music-2.6 100 songs/day
+Yearly Token Plans
+Standard Plans:
+Starter Plus Max
+Price
+$100 /year
+$200 /year
+$500 /year
+M2.7
+1,500 requests/5hrs
+4,500 requests/5hrs
+15,000 requests/5hrs
+Highspeed Plans:
+Plus-Highspeed Max-Highspeed Ultra-Highspeed
+Price
+$400 /year
+$800 /year
+$1,500 /year
+M2.7-highspeed
+4,500 requests/5hrs
+15,000 requests/5hrs
+30,000 requests/5hrs