feat(db): add userFiles table and migration

Introduces the user_files table to track uploaded files per user,
including metadata fields for dimensions, versioning, and tool chains.

apps/api/drizzle/0004_married_forgotten_one.sql

@@ -0,0 +1,15 @@
+CREATE TABLE `user_files` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text,
+	`original_name` text NOT NULL,
+	`stored_name` text NOT NULL,
+	`mime_type` text NOT NULL,
+	`size` integer NOT NULL,
+	`width` integer,
+	`height` integer,
+	`version` integer DEFAULT 1 NOT NULL,
+	`parent_id` text,
+	`tool_chain` text,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);