chore(release): merge MVP patches and AI features into main

[salmanabdurrahman]

This PR merges the latest dev branch into main, delivering multiple MVP improvements, AI onboarding capabilities, and realistic seed data for production-readiness.

Highlights

• AI onboarding with Gemini model
• Daily content system (motivations & challenges)
• Enhanced community posts with category support
• Rate limiting for API stability
• Database seeding for richer demo environments
• Full localization of API messages to Indonesian

Impact

• Prepares production for MVP rollout
• Improves system reliability and scalability
• Enhances user experience through AI and personalization
• Ensures cleaner structure and consistent configurations

Notes

• Requires new .env variable: GEMINI_MODEL
• Database schema and seeds must be re-synced before deployment

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