chore: add CLAUDE.md, initial Drizzle migration, and update gitignore

Add project instructions for Claude Code, the initial database migration,
and ignore the .claude/ local config directory.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

drizzle/0000_bitter_luckman.sql

@@ -0,0 +1,68 @@
+CREATE TABLE `categories` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`emoji` text DEFAULT '📦' NOT NULL,
+	`created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `categories_name_unique` ON `categories` (`name`);--> statement-breakpoint
+CREATE TABLE `items` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`weight_grams` real,
+	`price_cents` integer,
+	`category_id` integer NOT NULL,
+	`notes` text,
+	`product_url` text,
+	`image_filename` text,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`category_id`) REFERENCES `categories`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE TABLE `settings` (
+	`key` text PRIMARY KEY NOT NULL,
+	`value` text NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `setup_items` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`setup_id` integer NOT NULL,
+	`item_id` integer NOT NULL,
+	FOREIGN KEY (`setup_id`) REFERENCES `setups`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`item_id`) REFERENCES `items`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `setups` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `thread_candidates` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`thread_id` integer NOT NULL,
+	`name` text NOT NULL,
+	`weight_grams` real,
+	`price_cents` integer,
+	`category_id` integer NOT NULL,
+	`notes` text,
+	`product_url` text,
+	`image_filename` text,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`thread_id`) REFERENCES `threads`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`category_id`) REFERENCES `categories`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE TABLE `threads` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`status` text DEFAULT 'active' NOT NULL,
+	`resolved_candidate_id` integer,
+	`category_id` integer NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`category_id`) REFERENCES `categories`(`id`) ON UPDATE no action ON DELETE no action
+);