feat: bridge‑aggregator (Orbiter, Hop, Linea Official)

[qvkare]

Problem

bridge_bridgeAssets currently supports only the official Linea ↔ Ethereum bridge.

Background

Orbiter, Hop, and LayerSwap all support Linea, offering cheaper routes and alternative liquidity.

Proposed Solution

1. Create BridgeProvider interface (quote, execute, status).
2. Integrate at least:
   • Linea Official
   • Orbiter
   • Hop Protocol
3. New tools
   • bridgeGetQuote(params) – returns best route array.
   • bridgeExecute(provider, quoteId).

Acceptance Criteria

• Quote comparison shows provider fees & estimated time.
• Execution path auto‑selects cheapest route when unspecified.
• Full unit tests using mocked provider SDKs.

Labels

enhancement feature:bridge