feat(backend): système de plugins — domaine, application, infrastructure (#43)

Lots B1-B4 : modèle de domaine des plugins (manifeste, capacités menus/layouts/MCP),
port et registre applicatif, chargement/validation en infrastructure, exposition DTO
et commandes Tauri. Tests cargo verts.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

crates/backend/src/dto.rs

@@ -20,6 +20,253 @@ use domain::{AgentBusyState, PageCursor, PageDirection, Project, ProjectId, Turn
 
 pub use crate::ticket_dto::*;
 
+// ---------------------------------------------------------------------------
+// Plugins (#43)
+// ---------------------------------------------------------------------------
+
+/// Plugin contribution summary DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginContributionSummaryDto {
+    /// Top-level menus count.
+    pub top_level_menus: usize,
+    /// Menu items count.
+    pub menu_items: usize,
+    /// Layouts count.
+    pub layouts: usize,
+    /// MCP servers count.
+    pub mcp_servers: usize,
+}
+
+impl From<application::PluginContributionSummary> for PluginContributionSummaryDto {
+    fn from(value: application::PluginContributionSummary) -> Self {
+        Self {
+            top_level_menus: value.top_level_menus,
+            menu_items: value.menu_items,
+            layouts: value.layouts,
+            mcp_servers: value.mcp_servers,
+        }
+    }
+}
+
+/// Admin plugin DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginAdminDto {
+    /// Plugin id.
+    pub id: String,
+    /// Display name.
+    pub display_name: String,
+    /// Publisher.
+    pub publisher: Option<String>,
+    /// Version.
+    pub version: String,
+    /// Description.
+    pub description: Option<String>,
+    /// Icon URL.
+    pub icon_url: Option<String>,
+    /// Source kind.
+    pub source_kind: String,
+    /// Source label.
+    pub source_label: Option<String>,
+    /// Lifecycle state.
+    pub lifecycle_state: domain::PluginLifecycleState,
+    /// Enabled flag.
+    pub enabled: bool,
+    /// Pending enable state.
+    pub pending_enable_state: Option<bool>,
+    /// Pending uninstall flag.
+    pub pending_uninstall: bool,
+    /// Restart required flag.
+    pub restart_required: bool,
+    /// Trust level.
+    pub trust_level: domain::PluginTrustLevel,
+    /// Contribution summary.
+    pub contribution_summary: PluginContributionSummaryDto,
+    /// Optional error.
+    pub error: Option<String>,
+}
+
+impl From<application::PluginAdmin> for PluginAdminDto {
+    fn from(value: application::PluginAdmin) -> Self {
+        Self {
+            id: value.id,
+            display_name: value.display_name,
+            publisher: value.publisher,
+            version: value.version,
+            description: value.description,
+            icon_url: value.icon_url,
+            source_kind: value.source_kind,
+            source_label: value.source_label,
+            lifecycle_state: value.lifecycle_state,
+            enabled: value.enabled,
+            pending_enable_state: value.pending_enable_state,
+            pending_uninstall: value.pending_uninstall,
+            restart_required: value.restart_required,
+            trust_level: value.trust_level,
+            contribution_summary: value.contribution_summary.into(),
+            error: value.error,
+        }
+    }
+}
+
+/// Review request DTO.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ReviewPluginPackageDto {
+    /// Source kind: `archive` or `directory`.
+    pub source_kind: String,
+    /// Local source path.
+    pub path: String,
+}
+
+/// Plugin review DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginReviewDto {
+    /// Manifest id.
+    pub id: String,
+    /// Display name.
+    pub display_name: String,
+    /// Publisher.
+    pub publisher: Option<String>,
+    /// Version.
+    pub version: String,
+    /// Description.
+    pub description: Option<String>,
+    /// Source kind.
+    pub source_kind: String,
+    /// Source label.
+    pub source_label: Option<String>,
+    /// Content hash.
+    pub content_hash: String,
+    /// Trust level.
+    pub trust_level: domain::PluginTrustLevel,
+    /// Summary.
+    pub contribution_summary: PluginContributionSummaryDto,
+    /// Manifest contributions.
+    pub contributes: domain::PluginContributionSet,
+}
+
+impl From<application::PluginReview> for PluginReviewDto {
+    fn from(value: application::PluginReview) -> Self {
+        Self {
+            id: value.manifest.id.as_str().to_owned(),
+            display_name: value.manifest.display_name,
+            publisher: value.manifest.publisher,
+            version: value.manifest.version.as_str().to_owned(),
+            description: value.manifest.description,
+            source_kind: value.source.kind().to_owned(),
+            source_label: Some(value.source.label().to_owned()),
+            content_hash: value.content_hash,
+            trust_level: value.trust_level,
+            contribution_summary: value.contribution_summary.into(),
+            contributes: value.manifest.contributes,
+        }
+    }
+}
+
+/// Plugin install result DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginInstallResultDto {
+    /// Installed plugin.
+    pub plugin: PluginAdminDto,
+    /// Review.
+    pub review: PluginReviewDto,
+    /// Restart required.
+    pub restart_required: bool,
+}
+
+impl From<application::PluginInstallResult> for PluginInstallResultDto {
+    fn from(value: application::PluginInstallResult) -> Self {
+        Self {
+            plugin: value.plugin.into(),
+            review: value.review.into(),
+            restart_required: value.restart_required,
+        }
+    }
+}
+
+/// Plugin uninstall result DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginUninstallResultDto {
+    /// Plugin id.
+    pub plugin_id: String,
+    /// Removal outcome.
+    pub removal_outcome: domain::RemovalOutcome,
+    /// Restart required.
+    pub restart_required: bool,
+}
+
+impl From<application::UninstallPluginResult> for PluginUninstallResultDto {
+    fn from(value: application::UninstallPluginResult) -> Self {
+        Self {
+            plugin_id: value.plugin_id,
+            removal_outcome: value.removal_outcome,
+            restart_required: value.restart_required,
+        }
+    }
+}
+
+/// Runtime catalog DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginRuntimeContributionCatalogDto {
+    /// Runtime plugins.
+    pub plugins: Vec<PluginRuntimePluginDto>,
+}
+
+/// Runtime plugin DTO.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginRuntimePluginDto {
+    /// Plugin id.
+    pub id: String,
+    /// Display name.
+    pub display_name: String,
+    /// Publisher.
+    pub publisher: Option<String>,
+    /// Version.
+    pub version: String,
+    /// Bundle URL.
+    pub bundle_url: String,
+    /// Icon URL.
+    pub icon_url: Option<String>,
+    /// Content hash.
+    pub content_hash: String,
+    /// Contributions.
+    pub contributes: domain::PluginContributionSet,
+}
+
+impl From<application::PluginRuntimeCatalog> for PluginRuntimeContributionCatalogDto {
+    fn from(value: application::PluginRuntimeCatalog) -> Self {
+        Self {
+            plugins: value
+                .plugins
+                .into_iter()
+                .map(PluginRuntimePluginDto::from)
+                .collect(),
+        }
+    }
+}
+
+impl From<application::PluginRuntimePlugin> for PluginRuntimePluginDto {
+    fn from(value: application::PluginRuntimePlugin) -> Self {
+        Self {
+            id: value.id,
+            display_name: value.display_name,
+            publisher: value.publisher,
+            version: value.version,
+            bundle_url: value.bundle_url,
+            icon_url: value.icon_url,
+            content_hash: value.content_hash,
+            contributes: value.contributes,
+        }
+    }
+}
+
 /// Request DTO for the `health` command.
 #[derive(Debug, Clone, Default, Deserialize)]
 #[serde(rename_all = "camelCase")]