feat: add user profile API endpoint

[Copilot]

No user profile endpoint existed to back a frontend profile page. Adds GET /api/v1/user/profile that aggregates wallet data across chains.

Changes

src/app/service/user_service.go (new)

• UserService.GetProfile(address) — queries users table to sum totalStaked (wei → ether) and points across all chains; derives activeStakes as Staked events minus withdraw events
• Warns via zap when decimal → float64 conversion loses precision

src/app/api/user_api.go (new)

• UserApi.GetProfile — resolves wallet address from JWT ****** or walletAddress query param (reuses extractWalletAddress); logs service errors before returning DBQueryFailed

src/core/gin/router/router.go

• Registers GET /api/v1/user/profile

Response shape

GET /api/v1/user/profile?walletAddress=0xabc...

{
  "code": 0,
  "msg": "OK",
  "data": {
    "address": "0xabc...",
    "totalStaked": 12.5,
    "points": 1234.56,
    "activeStakes": 3
  }
}

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