fix(swagger): add @ApiProperty decorators to inline controller DTOs (#355)

[PINYOPATTANAWASANPORN]

Summary of Changes

Annotates all properties across the six inline controller-defined DTOs with @ApiProperty() from @nestjs/swagger, ensuring that Swagger UI (/api/docs) accurately renders request body schemas for money-moving and PII endpoints.

Fixes #355

Changes By Component

• src/maintenance-pool/maintenance-pool.controller.ts:
  • DepositDto: @ApiProperty() on amount and funderAddress
  • AssignRewardDto: @ApiProperty() on issueId, amount, recipientAddress, and recipientId (optional)
• src/bounties/bounties.controller.ts:
  • FundBountyDto: @ApiProperty() on funderAddress
• src/users/users.controller.ts:
  • SetStellarAddressDto: @ApiProperty() on stellarAddress
• src/milestones/milestones.controller.ts:
  • FundMilestoneDto: @ApiProperty() on funderAddress
  • ResolveIssueDto: @ApiProperty() on recipientAddress and recipientId (optional)

Verification & Testing

• Validated that all 6 inline classes import ApiProperty from @nestjs/swagger.
• Verified each property definition matches existing DTO conventions across src/*/dto/*.dto.ts.
• Zero runtime logic changes or breaking schema modifications.

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