Create CRUD endpoints for OpenAiPrompt entity in Admin section

[Copilot]

This PR implements CRUD endpoints for the OpenAiPrompt entity within the Admin section as requested in the issue.

Changes Made

1. Created DTO and Request Models

• OpenAiPromptDto: Record containing all properties from the OpenAiPrompt entity (Id, Prompt, Model, Engine, CreatedAt, UpdatedAt)
• OpenAiPromptEditRequest: Record with validation attributes for create/update operations

2. Implemented AiPromptController

• Base route: /api/admin/ai-prompts
• Authorization: Requires Admin role using [HasAnyRole(Role.Admin)]
• Endpoints:
  • GET /api/admin/ai-prompts - Returns non-paginated list of all OpenAI prompts
  • POST /api/admin/ai-prompts - Creates new OpenAI prompt
  • PUT /api/admin/ai-prompts - Updates existing OpenAI prompt
  • DELETE /api/admin/ai-prompts/{id} - Deletes OpenAI prompt by ID

3. Enhanced OpenAiPrompt Entity

• Added IHasIdBase<OpenAiPromptType> interface to support enum-based ID operations
• Added update methods for protected properties: UpdatePrompt(), UpdateModel(), UpdateEngine()

4. Extended Database Context Utilities

• Added generic extension methods ByIdOrFailAsync<T, TKey> and ByIdOrNullAsync<T, TKey> to handle enum-based ID lookups
• These methods support entities with non-standard ID types (like OpenAiPromptType enum)

API Usage Examples

// GET /api/admin/ai-prompts
[
  {
    "id": 1,
    "prompt": "You are a helpful career assistant...",
    "model": "gpt-4o",
    "engine": 1,
    "createdAt": "2025-06-29T12:04:00Z",
    "updatedAt": "2025-06-29T12:04:00Z"
  }
]

// POST /api/admin/ai-prompts
{
  "id": 3,
  "prompt": "Custom prompt text",
  "model": "gpt-4",
  "engine": 1
}

// PUT /api/admin/ai-prompts
{
  "id": 1,
  "prompt": "Updated prompt text",
  "model": "gpt-4o-mini",
  "engine": 1
}

Technical Notes

The OpenAiPrompt entity uses OpenAiPromptType enum as the primary key instead of the typical long ID, which required special handling in the extension methods and CRUD operations. All endpoints follow existing patterns for authorization, validation, and error handling.

Fixes #138.

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