fix(moderation): Enforce pagination bounds on content-reports list endpoint (#1306)

[boalambo]

Summary

Enforces sane pagination bounds on src/moderation/reports/content-reports.controller.ts's list endpoint, so a client can no longer request an unbounded number of rows (memory/DoS and performance risk) or pass negative/non-numeric pagination values.

Closes #1306

Changes

• dto/list-content-reports-query.dto.ts
  • Replaced the unbounded limit field with validated page and limit fields using @IsInt, @Min, @Max from class-validator.
  • limit is capped at MAX_PAGE_SIZE (100) and defaults to DEFAULT_PAGE_SIZE (10) when omitted.
  • page defaults to 1 and must be a positive integer.
  • Both constants are pulled from the shared APP_CONSTANTS for consistency with the rest of the codebase.
  • Added JSDoc documenting the default and maximum page size.
• content-reporting.service.ts
  • Computes skip from page/limit and passes both take/skip to the repository query, replacing the old query.limit ?? 50 fallback that had no upper bound.

Verification

• npm run typecheck passes with no errors.
• Confirmed ListContentReportsQueryDto is already wired into the controller's listReports handler via @Query(), so validation runs through the app's global ValidationPipe.
• Confirmed DEFAULT_PAGE_SIZE (10) and MAX_PAGE_SIZE (100) exist in src/common/constants/app.constants.ts.

Acceptance criteria

• ✅ Requesting an oversized limit is rejected with 400 (@Max(MAX_PAGE_SIZE)).
• ✅ Invalid pagination values (negative, zero, non-numeric) return 400 (@IsInt, @Min(1)).
• ✅ A default page size (10) applies when parameters are omitted.

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[boalambo]

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