fix(api): model claude selalu pakai Opus dari settings.json, bukan deepseek

TUI turn.rs & daemon handler.rs ambil model langsung dari
settings.model (tersimpan 'deepseek-v4-flash-free' di
~/.local/share/zesdex/settings.json) padahal provider sudah 'claude'.

- feat(domain): resolve_effective_model() — saat provider claude, model
  diambil dari app_config provider claude (default_model=claude-opus-4-8
  hasil deteksi ~/.claude/settings.json), menang atas settings.model basi.
  Provider non-claude tetap hormati settings.model user.
- fix(tui): turn.rs pakai resolve_effective_model (bukan settings.model)
- fix(daemon): handler.rs run_turn + compaction pakai resolve_effective_model
- fix(data): ~/.local/share/zesdex/settings.json model deepseek -> claude-opus-4-8
- test: 3 unit test resolve_effective_model

apps/interfaces/tui/src/turn.rs

@@ -80,7 +80,7 @@ pub fn spawn_agent_turn(state: &mut AppStateRest, text: String) {
     // ── Resolve provider configuration ─────────────────────────────────
     let provider_name = &state.settings.provider;
     let api_key = resolve_api_key(state, provider_name);
-    let model = state.settings.model.clone();
+    let model = zesdex_domain::cms::resolve_effective_model(&state.settings, &state.app_config);
     let api_base = resolve_api_base(state, provider_name);
 
     // ── Build message list ─────────────────────────────────────────────