feat(plugins): paramètres projet plugins + attribution skills/tools aux agents — #282 (manifeste accepte contributes.skills IdeA-native multi-harness; store .ideai/project-plugins.json v1: enable plugin par projet + assignments skills/tools par agent; refs + use cases settings/assign/unassign; resolver skills pour idea_skill_read et injection catalogue lancement agent; permissions MCP dynamiques projetées par harness Claude Code/Codex/OpenCode; tombstones uninstall, hot reload recalcule catalogue et marque assignments cassés; frontend: Settings projet Plugins, détail capabilities, attribution agent, catalogue permissions; bump pointeur IdeaSDK 6eb8db3; QA verte: cargo test -p application, project_plugin_settings 3/3, dto_plugins 2/2, structured_launch_d3 26/26, catalogue mcp 7/7, frontend 5 tests ProjectPluginSettings/plugin, npm build frontend)

crates/backend/src/dto.rs

@@ -36,6 +36,8 @@ pub use crate::ticket_dto::*;
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct PluginContributionSummaryDto {
+    /// Agent skills count.
+    pub skills: usize,
     /// Top-level menus count.
     pub top_level_menus: usize,
     /// Menu items count.
@@ -51,6 +53,7 @@ pub struct PluginContributionSummaryDto {
 impl From<application::PluginContributionSummary> for PluginContributionSummaryDto {
     fn from(value: application::PluginContributionSummary) -> Self {
         Self {
+            skills: value.skills,
             top_level_menus: value.top_level_menus,
             menu_items: value.menu_items,
             slash_commands: value.slash_commands,
@@ -60,6 +63,89 @@ impl From<application::PluginContributionSummary> for PluginContributionSummaryD
     }
 }
 
+/// Project-scoped plugin activation and assignment settings returned to clients.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectPluginSettingsDto {
+    /// Schema version.
+    pub version: u32,
+    /// Per-project plugin activation choices.
+    pub plugins: Vec<domain::ProjectPluginActivation>,
+    /// Per-agent plugin capability assignments.
+    pub agents: Vec<domain::AgentPluginAssignments>,
+}
+
+impl From<domain::ProjectPluginSettings> for ProjectPluginSettingsDto {
+    fn from(value: domain::ProjectPluginSettings) -> Self {
+        Self {
+            version: value.version,
+            plugins: value.plugins,
+            agents: value.agents,
+        }
+    }
+}
+
+/// Project plugin settings plus the globally installed manifest catalogue.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProjectPluginSettingsViewDto {
+    /// Persisted project settings.
+    pub settings: ProjectPluginSettingsDto,
+    /// Currently installed and valid plugin manifests.
+    pub installed: Vec<domain::PluginManifest>,
+}
+
+impl From<application::ProjectPluginSettingsView> for ProjectPluginSettingsViewDto {
+    fn from(value: application::ProjectPluginSettingsView) -> Self {
+        Self {
+            settings: value.settings.into(),
+            installed: value.installed,
+        }
+    }
+}
+
+/// Request to toggle a globally installed plugin for one project.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SetProjectPluginEnabledRequestDto {
+    /// Owning project id.
+    pub project_id: String,
+    /// Globally installed plugin id.
+    pub plugin_id: String,
+    /// Desired project activation state.
+    pub enabled: bool,
+}
+
+/// Request to assign or unassign a plugin skill for an agent.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MutateAgentPluginSkillRequestDto {
+    /// Owning project id.
+    pub project_id: String,
+    /// Target agent id.
+    pub agent_id: String,
+    /// Owning plugin id.
+    pub plugin_id: String,
+    /// Manifest-local skill id.
+    pub skill_id: String,
+}
+
+/// Request to assign or unassign a plugin MCP tool for an agent.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MutateAgentPluginToolRequestDto {
+    /// Owning project id.
+    pub project_id: String,
+    /// Target agent id.
+    pub agent_id: String,
+    /// Owning plugin id.
+    pub plugin_id: String,
+    /// Manifest-local MCP server id.
+    pub server_id: String,
+    /// Tool name advertised by that server.
+    pub tool_name: String,
+}
+
 /// Admin plugin DTO.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]