feat(plugins): load activation scope from plugin manifest

Plugins can now declare activationScope ("app" | "project") in their
manifest; loader/runtime honor it to defer activation of project-scoped
plugins until a project is focused instead of activating everything at
app bootstrap. Bumps sdk/IdeaSDK to the commit that adds the field.

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

crates/app-tauri/src/plugins.rs

@@ -754,6 +754,7 @@ mod tests {
                 icon: None,
                 trust_level: PluginTrustLevel::Full,
                 capabilities: Vec::new(),
+                activation_scope: domain::PluginActivationScope::default(),
                 contributes: PluginContributionSet::default(),
             })
         }