feat: tiered API plans (Free/Bronze/Gold/Platinum)

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- Free: $0, 30 req/min, market data only
- Bronze: $29/mo, 100 req/min, + companies & search
- Gold: $99/mo, 500 req/min, + filings & historical
- Platinum: $299/mo, 2000 req/min, all features + priority
- Plan-aware rate limiting per API key (or per IP for free)
- Usage tracking with daily aggregation
- GET /api/v1/plans — plan listing
- POST /api/v1/plans/register — instant free API key
- GET /api/v1/plans/usage — usage stats
- /pricing — dark-themed HTML pricing page
- X-RateLimit-* and X-Plan headers on every response
- Restricted endpoints return upgrade prompt
- Updated OpenAPI spec with security scheme
- 53 handlers, compiles clean

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Rainbow

2026-02-10 12:55:45 -03:00

parent 3080a60711

commit a2b0db8f3f

11 changed files with 807 additions and 7 deletions

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