feat: Add review events persistence, version display, and auto-versioning system

backend/migrations/add_review_events.sql

@@ -0,0 +1,17 @@
+-- Migration: Add review_events table
+
+CREATE TABLE IF NOT EXISTS review_events (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    review_id INTEGER NOT NULL,
+    event_type VARCHAR(50) NOT NULL,
+    step VARCHAR(100),
+    message TEXT,
+    data JSON,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (review_id) REFERENCES reviews(id) ON DELETE CASCADE
+);
+
+-- Create indexes for better performance
+CREATE INDEX IF NOT EXISTS idx_review_events_review_id ON review_events(review_id);
+CREATE INDEX IF NOT EXISTS idx_review_events_created_at ON review_events(created_at);
+