feat: add organization exercise settings management

- Created a new SQL migration to define the organization_exercise_settings table with relevant fields and an index.
- Implemented handlers for loading and updating organization exercise settings in Rust, including default values and upsert functionality.
- Developed a React component for managing exercise feature settings, allowing toggling of features and saving updates to the backend.

services/cms-service/migrations/20260413000001_organization_exercise_settings.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS organization_exercise_settings (
+    organization_id UUID PRIMARY KEY REFERENCES organizations(id) ON DELETE CASCADE,
+    audio_response_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    hotspot_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    memory_match_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    peer_review_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    role_playing_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    mermaid_enabled BOOLEAN NOT NULL DEFAULT FALSE,
+    code_lab_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_org_exercise_settings_updated_at
+    ON organization_exercise_settings (updated_at DESC);