feat: add mentorship assignments and peer review enhancements

- Create `mentorship_assignments` table with relevant fields and indexes.
- Add `peer_review_settings` table for lesson-specific peer review configurations.
- Enhance `peer_reviews` and `course_submissions` tables with additional fields for instructor reviews and final scores.
- Implement My Notes page to display user annotations with delete functionality.
- Create Lesson Annotations component for managing notes with editing and deletion capabilities.
- Develop Mentor Panel component to display mentor and mentee information.
- Add Course Mentorships page for assigning mentors to students with modal for selection.

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

services/lms-service/migrations/20260428000001_lesson_annotations.sql

@@ -0,0 +1,19 @@
+-- Fase 41-B: Anotaciones Privadas en Lecciones
+CREATE TABLE IF NOT EXISTS lesson_annotations (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id         UUID NOT NULL,
+    lesson_id       UUID NOT NULL,
+    organization_id UUID NOT NULL,
+    course_id       UUID NOT NULL,
+    content         TEXT NOT NULL,
+    -- JSON libre: { "type": "timestamp", "value": 42.5 } | { "type": "scroll", "value": 0.35 }
+    position_data   JSONB,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_lesson_annotations_user_lesson
+    ON lesson_annotations (user_id, lesson_id);
+
+CREATE INDEX IF NOT EXISTS idx_lesson_annotations_user_org
+    ON lesson_annotations (user_id, organization_id);

services/lms-service/migrations/20260428000002_mentorship_assignments.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS mentorship_assignments (
+    id              UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID        NOT NULL,
+    course_id       UUID        NOT NULL,
+    mentor_id       UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    student_id      UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    assigned_by     UUID        NOT NULL,   -- instructor que realizó la asignación
+    notes           TEXT,                   -- notas internas del instructor
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (course_id, mentor_id, student_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_mentorship_course       ON mentorship_assignments (course_id, organization_id);
+CREATE INDEX IF NOT EXISTS idx_mentorship_mentor       ON mentorship_assignments (mentor_id, organization_id);
+CREATE INDEX IF NOT EXISTS idx_mentorship_student      ON mentorship_assignments (student_id, organization_id);

services/lms-service/migrations/20260428000003_peer_review_enhanced.sql

@@ -0,0 +1,31 @@
+-- Fase 41-F: Evaluación entre Pares Mejorada
+
+-- Configuración de peer review por lección
+CREATE TABLE IF NOT EXISTS peer_review_settings (
+    id              UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+    lesson_id       UUID        NOT NULL UNIQUE REFERENCES lessons(id) ON DELETE CASCADE,
+    organization_id UUID        NOT NULL,
+    required_reviews INT        NOT NULL DEFAULT 2,   -- cuántas revisiones necesita cada entrega
+    peer_weight      INT        NOT NULL DEFAULT 70,  -- 0-100: peso del promedio de pares en la nota final
+    instructor_weight INT       NOT NULL DEFAULT 30,  -- 0-100: peso de la calificación del instructor
+    rubric_id        UUID,                             -- rúbrica externa (CMS) para orientar la evaluación
+    auto_assign      BOOLEAN    NOT NULL DEFAULT true, -- asignación automática al entregar
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT peer_weights_sum CHECK (peer_weight + instructor_weight = 100)
+);
+
+CREATE INDEX IF NOT EXISTS idx_peer_review_settings_lesson ON peer_review_settings (lesson_id);
+
+-- Calificación del instructor sobre una entrega
+ALTER TABLE peer_reviews
+    ADD COLUMN IF NOT EXISTS is_instructor_review BOOLEAN NOT NULL DEFAULT false;
+
+-- Calificación final calculada (desnormalizada para eficiencia)
+ALTER TABLE course_submissions
+    ADD COLUMN IF NOT EXISTS final_score  FLOAT,          -- NULL mientras no esté completo
+    ADD COLUMN IF NOT EXISTS review_count INT NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS status       TEXT NOT NULL DEFAULT 'pending';
+    -- status: 'pending' | 'under_review' | 'graded'
+
+CREATE INDEX IF NOT EXISTS idx_course_submissions_status ON course_submissions (lesson_id, status);