feat: add study rooms feature with BigBlueButton integration

- Create database migrations for study_rooms table in both cms-service and lms-service.
- Implement study room handlers in lms-service for listing, creating, joining, ending, and deleting study rooms.
- Develop frontend components for managing study rooms in both experience and studio applications.
- Add UI for creating new study rooms, displaying active and ended rooms, and joining sessions.
- Include instructions for configuring BigBlueButton server settings.

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

services/lms-service/migrations/20260427000005_study_rooms.sql

@@ -0,0 +1,26 @@
+-- Salas de Estudio (Fase 38) -----------------------------------------------
+CREATE TABLE IF NOT EXISTS study_rooms (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    course_id       UUID NOT NULL REFERENCES courses(id) ON DELETE CASCADE,
+    created_by      UUID NOT NULL,  -- user_id del instructor
+    title           VARCHAR(255) NOT NULL,
+    description     TEXT,
+    -- Estado: pending | active | ended
+    status          VARCHAR(32) NOT NULL DEFAULT 'pending',
+    -- BBB
+    bbb_meeting_id  VARCHAR(255),
+    bbb_internal_id VARCHAR(255),
+    attendee_pw     VARCHAR(128),
+    moderator_pw    VARCHAR(128),
+    join_url        TEXT,
+    scheduled_at    TIMESTAMPTZ,
+    started_at      TIMESTAMPTZ,
+    ended_at        TIMESTAMPTZ,
+    max_participants INT DEFAULT 50,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_study_rooms_course ON study_rooms(course_id);
+CREATE INDEX IF NOT EXISTS idx_study_rooms_org ON study_rooms(organization_id);