Feat/api endpoint

[Aharshi3614]

Closes #209

Added API versioning with /api/v1 prefix and comprehensive API documentation.

Changes:

• All endpoints now accessible via /api/v1/ prefix
• Created docs/API.md with all endpoints documented
• Kept backward compatibility (old endpoints still work)

Endpoints Versioned:

Before	After
/api/auth/login	/api/v1/auth/login
/api/history	/api/v1/history
/analytics	/api/v1/analytics
/api/chat	/api/v1/chat

Endpoints Documented:

• Auth Routes (register, login, profile)
• Prediction Routes (predict, bulk-predict, feedback)
• Analytics Routes (page-visits, visits-by-role)
• Email Integration (Gmail, Outlook)
• Public Routes (health, wordcloud, importance)

Response Format Documented:

{
  "success": true,
  "data": { ... }
}

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