Hoops adapter integration for external DEX pools

[alexanderkoh]

Description

Currently join_campaign only supports TinyAMM pools directly (adapter_id=0). To support campaigns targeting pools on Aqua, Comet, Phoenix, and SoroSwap, we need to integrate the Hoops Finance adapter system.

What's needed

1. Deploy Hoops Router to testnet/mainnet
2. Deploy protocol adapters (SoroSwap, Aqua, Phoenix, Comet) from /srv/repos/hoopsws/workspace/contracts/hoops-contracts/adapters/
3. Register adapters with the router
4. Update Campaign Manager's swap_and_deposit() to call Hoops adapters when adapter_id > 0
5. Update frontend pool selector to show pools from multiple DEXes

Current state

• adapter_id == 0 → direct TinyAMM pool (working, tested on testnet)
• adapter_id > 0 → returns AdapterCallFailed (not implemented)
• Hoops adapter interface defined at hoops-adapter-interface crate (SDK 25.1.0)
• All 4 adapters exist and implement AdapterTrait

Architecture

Campaign Manager
├── adapter_id 0 → TinyAMM direct (swap_received + deposit)
├── adapter_id 1 → Hoops Router → Aqua Adapter
├── adapter_id 2 → Hoops Router → Comet Adapter  
├── adapter_id 3 → Hoops Router → Phoenix Adapter
└── adapter_id 4 → Hoops Router → SoroSwap Adapter

SDK version note

Hoops contracts use soroban-sdk 25.1.0, FlashPool uses 22.0.8. Cross-contract calls work across versions via WASM ABI.