core: implement protocol governance panel

[EmeditWeb]

Problem

No interface exists for protocol admin management.
Admin operations require raw API calls.

What To Build

Build /admin page with:

1. Protocol parameters panel
2. Vendor approval queue
3. Loan review queue
4. Protocol stats overview
5. Audit log viewer

Files To Touch

• src/pages/Admin.tsx (new)
• src/hooks/useAdmin.ts (new)
• src/router/index.tsx

Acceptance Criteria

• Non-admin wallets cannot access /admin
• Parameter updates build correct XDR
• Vendor approval triggers API call
• Audit log loads and paginates
• npm run build passes

Mandatory Checks Before PR

• npm run build passes
• No any types
• PR references this issue

[Godfrey-Delight]

Hi maintainer, I would love to work on this issue

[adelekevictor12]

I will like to work on this task

[Vicsygold]

BOSS PLS GIVE ME THIS PROJECT

[grantfox-oss]

🦊 GrantFox — @Vicsygold has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #24)
2. Your PR will be reviewed by the StepFi-app maintainers

Good luck! Track your progress on GrantFox.