feat: add PluginBlock component for rendering external web components in sandboxed iframes

feat: implement PluginsPage for managing plugins with create, toggle, and delete functionalities

feat: create PedagogicalAnalyticsPage for displaying course analytics including quality metrics, discrimination index, and curricular suggestions

Co-authored-by: Copilot <copilot@github.com>

services/lms-service/migrations/20260427000001_lesson_collaborative_canvas.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS lesson_collaborative_canvases (
+    lesson_id UUID PRIMARY KEY REFERENCES lessons(id) ON DELETE CASCADE,
+    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    canvas_state JSONB NOT NULL DEFAULT '{}'::jsonb,
+    updated_by UUID REFERENCES users(id) ON DELETE SET NULL,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_lesson_collaborative_canvases_org_id
+    ON lesson_collaborative_canvases (organization_id);