feat: complete marketing command center with pipeline, UI, and asset generation

- Dashboard with campaign management, asset gallery, and publishing queue
- 7-agent pipeline: trend scout, research, scripts, ad creative, video, copy, distribution
- Campaign form with screenshot upload, goal picker, platform selection
- Campaign detail view with Details/Pipeline/Assets/Chat tabs
- Two-set image generation: Gemini AI (NanoBanana MCP) + Canvas Design posters
- Remotion video rendering with phone.png frame and real screenshot alignment
- honeyDue branding: blue #0079FF, orange #FF9400, Inter font, warm off-white
- Asset cards with source badges (Gemini/Canvas/Remotion/Playwright)
- Markdown/JSON render endpoint for viewing pipeline outputs as HTML
- Settings page with Tavily, Gemini, Postiz, Nextdoor integration management
- Claude Chat for campaign feedback loop with streaming SSE
- Postiz publishing modal with scheduling
- Auth with NextAuth credentials + JWT sessions
- SQLite via Prisma with better-sqlite3 adapter

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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