Add validation for god names in GodInput model and endpoint

[Copilot]

No validation was enforced on god name inputs, allowing empty, excessively long, or malformed values to reach the database.

Changes

GodInput model — data annotation constraints

• Name: [Required], [MinLength(1)], [MaxLength(100)], [RegularExpression(@"^[\p{L}\s'\-\.]+$")] — letters (Unicode), spaces, hyphens, apostrophes, dots only
• Description: [Required], [MinLength(1)], [MaxLength(500)]
• MythologyId: [Range(1, int.MaxValue)]

AddOrUpdateGods endpoint — explicit validation with structured error response

Replaced the one-liner pass-through with validation via Validator.TryValidateObject, returning Results.ValidationProblem (HTTP 400) with per-field, per-index error keys on failure:

// POST /api/v1/gods with [{ "name": "Zeus123", "mythologyId": 1, "description": "..." }]
// 400 Bad Request:
{
  "errors": {
    "[0].Name": ["Name may only contain letters, spaces, hyphens, apostrophes, and dots."]
  }
}

Tests

• Unit: 6 new cases covering empty name, name too long, invalid characters, valid name with hyphen/apostrophe, invalid MythologyId, empty description
• Integration: 4 new cases verifying HTTP 400 for invalid payloads and HTTP 200 for a valid god submission

[Copilot]

Pull request overview

This PR adds server-side validation for GodInput fields to prevent empty/overlong/malformed god data from reaching the database, and updates the /api/v1/gods POST endpoint to return structured validation errors (HTTP 400) when inputs are invalid.

Changes:

• Added data-annotation constraints to GodInput (Name, Description, MythologyId).
• Updated AddOrUpdateGods endpoint to validate each item and return Results.ValidationProblem(...) on failure.
• Added/updated unit and integration tests for invalid and valid POST payloads.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/Gods/Models/God.cs	Adds data-annotation validation rules to GodInput.
src/Endpoints/v1/Gods.cs	Validates GodInput list items and returns a validation problem result on errors.
tests/UnitTests/GodEndpointsTests.cs	Updates unit tests for new IResult return type and adds invalid-input cases.
tests/IntegrationTests/GodsEndpointTests.cs	Adds integration coverage for POSTing valid/invalid gods.

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