Extract groombook/api from monorepo with CI workflow

- Add source code from apps/api
- Add packages/db and packages/types workspace dependencies
- Add GitHub Actions CI workflow (lint, typecheck, test, docker)
- Generate pnpm-lock.yaml
- Add .gitignore

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/migrations/0010_impersonation_sessions.sql

@@ -0,0 +1,26 @@
+-- Create impersonation_session_status enum and tables
+CREATE TYPE "impersonation_session_status" AS ENUM ('active', 'ended', 'expired');
+
+CREATE TABLE "impersonation_sessions" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"staff_id" uuid NOT NULL,
+	"client_id" uuid NOT NULL,
+	"reason" text,
+	"status" "impersonation_session_status" DEFAULT 'active' NOT NULL,
+	"started_at" timestamp DEFAULT now() NOT NULL,
+	"ended_at" timestamp,
+	"expires_at" timestamp NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	CONSTRAINT "impersonation_sessions_staff_id_staff_id_fk" FOREIGN KEY ("staff_id") REFERENCES "staff"("id") ON DELETE restrict,
+	CONSTRAINT "impersonation_sessions_client_id_clients_id_fk" FOREIGN KEY ("client_id") REFERENCES "clients"("id") ON DELETE restrict
+);
+
+CREATE TABLE "impersonation_audit_logs" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"session_id" uuid NOT NULL,
+	"action" text NOT NULL,
+	"page_visited" text,
+	"metadata" jsonb,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	CONSTRAINT "impersonation_audit_logs_session_id_impersonation_sessions_id_fk" FOREIGN KEY ("session_id") REFERENCES "impersonation_sessions"("id") ON DELETE cascade
+);