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/app-tauri/tests/dto_model_servers.rs

@@ -0,0 +1,111 @@
+//! DTO contract tests for local model-server IPC.
+
+use app_tauri_lib::dto::{
+    ModelServerConfigDto, ModelServerKindDto, SaveModelServerRequestDto, StopPolicyDto,
+    save_model_server_input,
+};
+use domain::model_server::{
+    ExecutablePath, LocalModelRef, LocalModelServerConfig, LocalModelServerKind, ModelPath,
+    ModelServerEndpoint,
+};
+use domain::{LocalModelServerId, StopPolicy};
+use serde_json::json;
+use uuid::Uuid;
+
+fn sid(n: u128) -> LocalModelServerId {
+    LocalModelServerId::from_uuid(Uuid::from_u128(n))
+}
+
+fn domain_config(id: LocalModelServerId, model_id: &str) -> LocalModelServerConfig {
+    LocalModelServerConfig::new(
+        id,
+        LocalModelServerKind::LlamaCpp,
+        "Local Qwen",
+        ModelServerEndpoint::new("http://localhost:8080", 8080).unwrap(),
+        LocalModelRef::new(
+            model_id,
+            "Qwen",
+            Some(ModelPath::new("/models/qwen.gguf").unwrap()),
+            "qwen3-coder",
+        )
+        .unwrap(),
+        Some(ExecutablePath::new("/usr/bin/llama-server").unwrap()),
+        vec!["--ctx-size".to_owned(), "4096".to_owned()],
+        true,
+        StopPolicy::StopOnAppExit,
+    )
+    .unwrap()
+}
+
+#[test]
+fn model_server_dto_serialises_flat_camelcase_wire_shape() {
+    let dto = ModelServerConfigDto::from_domain(domain_config(sid(35), "internal-model-id"));
+
+    let value = serde_json::to_value(dto).unwrap();
+
+    assert_eq!(value["id"], sid(35).to_string());
+    assert_eq!(value["kind"], "llamaCpp");
+    assert_eq!(value["baseURL"], "http://localhost:8080/v1");
+    assert_eq!(value["modelPath"], "/models/qwen.gguf");
+    assert_eq!(value["servedModelName"], "qwen3-coder");
+    assert_eq!(value["binaryPath"], "/usr/bin/llama-server");
+    assert_eq!(value["stopPolicy"], "stopOnAppExit");
+    assert!(value.get("model").is_none(), "domain model must not leak");
+    assert!(value.get("endpoint").is_none(), "domain endpoint must not leak");
+}
+
+#[test]
+fn model_server_dto_deserialises_flat_wire_shape_and_generates_model_id() {
+    let raw = json!({
+        "id": sid(36).to_string(),
+        "kind": "llamaCpp",
+        "name": "Local Qwen",
+        "baseURL": "http://localhost:8081",
+        "port": 8081,
+        "modelPath": "/models/qwen.gguf",
+        "servedModelName": "qwen3-coder",
+        "binaryPath": "/usr/bin/llama-server",
+        "args": ["--ctx-size", "4096"],
+        "autoStart": true,
+        "stopPolicy": "stopOnAppExit"
+    });
+
+    let request = SaveModelServerRequestDto {
+        config: serde_json::from_value(raw).unwrap(),
+    };
+    let input = save_model_server_input(request, None).unwrap();
+
+    assert_eq!(input.config.id, sid(36));
+    assert_eq!(input.config.kind, LocalModelServerKind::LlamaCpp);
+    assert_eq!(input.config.endpoint.base_url, "http://localhost:8081/v1");
+    assert_eq!(
+        input.config.model.path.unwrap().as_str(),
+        "/models/qwen.gguf"
+    );
+    assert_eq!(input.config.model.served_name, "qwen3-coder");
+    assert_eq!(input.config.model.label, "qwen3-coder");
+    assert!(!input.config.model.id.is_empty());
+}
+
+#[test]
+fn model_server_dto_preserves_existing_internal_model_id_on_upsert() {
+    let existing = domain_config(sid(37), "stable-internal-id");
+    let dto = ModelServerConfigDto {
+        id: sid(37).to_string(),
+        kind: ModelServerKindDto::LlamaCpp,
+        name: "Updated Qwen".to_owned(),
+        base_url: "http://localhost:8082/v1".to_owned(),
+        port: 8082,
+        model_path: Some("/models/qwen-updated.gguf".to_owned()),
+        served_model_name: "qwen3-coder-updated".to_owned(),
+        binary_path: Some("/usr/bin/llama-server".to_owned()),
+        args: Vec::new(),
+        auto_start: true,
+        stop_policy: StopPolicyDto::StopOnAppExit,
+    };
+
+    let config = dto.into_domain(Some(&existing)).unwrap();
+
+    assert_eq!(config.model.id, "stable-internal-id");
+    assert_eq!(config.model.served_name, "qwen3-coder-updated");
+}