LaunchPix billing, auth, and Mistral image generation updates

[Abdulmuiz44]

Summary

• switch billing to Lemon Squeezy credit packs with 300-credit account baseline
• add detailed About, Contact, Privacy, and Terms pages
• improve the generated asset result screen
• generate final image assets through a Mistral image-generation agent with deterministic fallback

Verification

• npm run typecheck
• npm run build

Deployment notes

• Netlify needs MISTRAL_IMAGE_MODEL and MISTRAL_IMAGE_AGENT_ID set
• Lemon Squeezy store, variant, API, and webhook env vars must be configured
• Lemon Squeezy webhook should send order_created events to /api/billing/webhook

[netlify]

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