Implement Create Investment API

[nikkybel]

PR: Pet Status Lifecycle Implementation (Closes #60 )

Overview

This PR implements the Pet Status Lifecycle feature, enforcing a state machine for pet status transitions throughout the adoption and custody process. It ensures that pets can only move between valid states, maintaining data integrity and preventing invalid transitions.

Features

• State Machine for Pet Status:
  • Enforces valid transitions: AVAILABLE → PENDING → ADOPTED, AVAILABLE → IN_CUSTODY → AVAILABLE, etc.
  • Blocks invalid transitions (e.g., ADOPTED → PENDING, IN_CUSTODY → ADOPTED).
  • Allows admin override for ADOPTED → AVAILABLE (return scenario).
• Transition Validation:
  • Centralized validator for all status changes.
  • Throws clear errors for invalid transitions.
  • Logs all status changes for audit trail.
• API Endpoints:
  • PATCH /pets/:id/status: Update pet status with validation and audit logging.
  • GET /pets/:id/transitions: Get allowed transitions and current status for a pet.
  • GET /pets/:id/transitions/allowed: Get allowed transitions for the current user (role-aware).
• Swagger Documentation:
  • All endpoints are fully documented and visible in Swagger UI.
  • Request/response schemas and examples included.
• Test Coverage:
  • Unit tests for all valid and invalid transitions.
  • Tests for admin overrides and edge case

Closes

• Custody Lifecycle State Machine #60 Pet Status Lifecycle

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[amina69]

@nikkybel the test failes and the branch also has conflict, kindly fix

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