feat(model-server): backend modèles locaux — serveur llama.cpp intégré (#35) et profils OpenCode locaux multiples (#36)

Sprint « Modeles locaux », couche backend (domain/application/infra/app-tauri).

#35 — Serveur de modèle local intégré (llama.cpp) :
- domain: model_server.rs (agrégat + statut), ports ModelServerProbe /
  ManagedProcess / ModelServerRuntime / ModelServerRegistry, événements
  model_server_status_changed et agent_launch_failed.
- application: use case EnsureLocalModelServer branché sur LaunchAgent.
- infrastructure: adapters HttpOpenAiCompatibleProbe, LlamaCppRuntime,
  LocalManagedProcess, FsModelServerRegistry.
- app-tauri: DTO plat LocalModelServerConfigDto, commandes
  list/save/delete_model_server avec garde model_server_in_use, wiring.

#36 — Profils OpenCode locaux multiples :
- domain: VO LocalModelServerId, OpenCodeConfig.local_model_server_id.
- application: use case CloneOpenCodeProfileFromSeed.
- app-tauri: commande clone_opencode_profile_from_seed, DTO/wiring.

Tests verts (exécution réelle) : domain+application OK, app-tauri
dto_model_servers 3/3 et dto_profiles 10/10, infra model_server 2/2,
application model_server+profile_usecases 19/19, cargo build workspace Finished.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/domain/src/lib.rs

@@ -49,6 +49,7 @@ pub mod mailbox;
 pub mod markdown;
 pub mod memory;
 pub mod memory_harvest;
+pub mod model_server;
 pub mod orchestrator;
 pub mod permission;
 pub mod ports;
@@ -72,8 +73,8 @@ mod validation;
 pub use error::DomainError;
 
 pub use ids::{
-    AgentId, IssueId, LayoutId, NodeId, ProfileId, ProjectId, ScheduleId, SessionId, SkillId,
-    SprintId, TabId, TaskId, TemplateId, WindowId,
+    AgentId, IssueId, LayoutId, LocalModelServerId, NodeId, ProfileId, ProjectId, ScheduleId,
+    SessionId, SkillId, SprintId, TabId, TaskId, TemplateId, WindowId,
 };
 
 pub use project::{Project, ProjectPath};
@@ -153,6 +154,12 @@ pub use memory_harvest::{
     MAX_BLOCK_BYTES, MAX_DESCRIPTION_CHARS,
 };
 
+pub use model_server::{
+    ExecutablePath, LocalModelRef, LocalModelServerConfig, LocalModelServerKind, ModelPath,
+    ModelServerEndpoint, ModelServerLifecycleStatus, ModelServerReady, ModelServerStatus,
+    StopPolicy,
+};
+
 pub use remote::{RemoteKind, RemoteRef, SshAuth};
 
 pub use terminal::{PtySize, SessionKind, SessionStatus, TerminalSession};