feat: implement phase 1 foundation for BookMyVenue

[fathhima]

Description

This PR adds the Phase 1 foundation for BookMyVenue and establishes the core structure needed for the full venue booking workflow.

Implemented in this phase:

• project setup and initial application structure
• authentication flow with OTP verification
• login and password reset flow
• role-based access control with admin support
• category management
• venue management with admin approval and rejection flow
• slot management
• booking flow
• payment integration

The goal of this submission is to lay a strong and scalable base for completing the end-to-end venue booking platform.

Phase Category

• Phase 1: MVP Submission (Base Foundation)
• Phase 2/3: Feature Implementation or Modularization
• Phase 4: Scalability Optimization
• General (Documentation, Bugfix, Chore, etc.)

Tech Stack (For Phase 1 MVP Submissions)

• Frontend: Android
• Backend: NestJS
• Database: PostgreSQL

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature / Module (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• I have read the Contribution Guidelines.
• My code follows the community spirit and standards of the WeCode community.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings or errors.

AI Disclosure

• I did NOT use AI tools to generate this code.
• I used AI tools (e.g., Copilot, ChatGPT, Claude) to help write this code, and I have fully reviewed, tested, and understand the output.

Screenshots / Screen Recording (if applicable)

N/A