Add infra for RPC testing

[Rigidity]

Note

Medium Risk
Moderate risk because it changes core wallet initialization/logging behavior (global tracing setup, test-mode toggles) and extends sync manager commands to accept injected peers, which could affect runtime behavior if misused.

Overview
Adds an in-process RPC test harness for sage-rpc by exposing make_router(...), introducing a PeerSimulator-backed tests.rs, and adding the needed dev-dependencies.

Refactors RPC TLS setup by extracting WalletCertVerifier and load_rustls_config into dedicated modules, and updates Sage::new to accept a test flag that disables file logging, avoids re-initializing the global tracing subscriber, and configures faster sync timeouts for tests.

Extends sage-wallet sync control with a new SyncCommand::AddPeer to inject a pre-connected peer/receiver (used by tests), updates CLI/Tauri call sites for the new Sage::new(..., test) signature, and includes minor CI (print Prettier version) plus small NFT UI formatting tweaks.

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[Rigidity]

Thanks to #745 for the general design idea

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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