feat: add feature to speak with the AI and create report from contexts

backend/internal/database/migrations/000005_reports.up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE reports (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    summary_id UUID REFERENCES summaries(id) ON DELETE SET NULL,
+    context_excerpt TEXT NOT NULL,
+    question TEXT NOT NULL,
+    answer TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);