feat(sf-fe-a12): Landing redesign + PilotCTA с real B3/B4 data (v2 rebased) (#367)
Hero + 5 KPI cards from GET /api/v1/landing/stats (B4, real DB), Pricing card 30k руб/мес, FAQ accordion, PilotRequestModal -> POST /api/v1/pilot/request (B3).
Round 2 fixes:
- B4 fail-loud: LandingStatsOut.stale flag, zeroed fallback, frontend skeleton
- B3 UUID contract: id:string, display tracking GD-{first8hex}
- PilotRequestModal: replaced manual overlay with <Drawer side="bottom"> (A3 #341) — focus trap, ESC, scroll-lock, focus restore
- Design tokens: all hex literals replaced with var(--*)
- HeadlineBar component used instead of hand-rolled dark div
Closes #82
Supersedes #366
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