Update extension system and database migrations

Changes:
- Added CLAUDE.md with project instructions
- Updated extension manifest bindings (TypeScript)
- Regenerated database migrations (consolidated into single migration)
- Updated haex schema with table name handling
- Enhanced extension manager and manifest handling in Rust
- Updated extension store in frontend
- Updated vault.db

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src-tauri/database/migrations/0000_dashing_night_nurse.sql

@@ -0,0 +1,104 @@
+CREATE TABLE `haex_crdt_configs` (
+	`key` text PRIMARY KEY NOT NULL,
+	`value` text
+);
+--> statement-breakpoint
+CREATE TABLE `haex_crdt_logs` (
+	`id` text PRIMARY KEY NOT NULL,
+	`haex_timestamp` text,
+	`table_name` text,
+	`row_pks` text,
+	`op_type` text,
+	`column_name` text,
+	`new_value` text,
+	`old_value` text
+);
+--> statement-breakpoint
+CREATE INDEX `idx_haex_timestamp` ON `haex_crdt_logs` (`haex_timestamp`);--> statement-breakpoint
+CREATE INDEX `idx_table_row` ON `haex_crdt_logs` (`table_name`,`row_pks`);--> statement-breakpoint
+CREATE TABLE `haex_crdt_snapshots` (
+	`snapshot_id` text PRIMARY KEY NOT NULL,
+	`created` text,
+	`epoch_hlc` text,
+	`location_url` text,
+	`file_size_bytes` integer
+);
+--> statement-breakpoint
+CREATE TABLE `haex_desktop_items` (
+	`id` text PRIMARY KEY NOT NULL,
+	`workspace_id` text NOT NULL,
+	`item_type` text NOT NULL,
+	`extension_id` text,
+	`system_window_id` text,
+	`position_x` integer DEFAULT 0 NOT NULL,
+	`position_y` integer DEFAULT 0 NOT NULL,
+	`haex_timestamp` text,
+	FOREIGN KEY (`workspace_id`) REFERENCES `haex_workspaces`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`extension_id`) REFERENCES `haex_extensions`(`id`) ON UPDATE no action ON DELETE cascade,
+	CONSTRAINT "item_reference" CHECK(("haex_desktop_items"."item_type" = 'extension' AND "haex_desktop_items"."extension_id" IS NOT NULL AND "haex_desktop_items"."system_window_id" IS NULL) OR ("haex_desktop_items"."item_type" = 'system' AND "haex_desktop_items"."system_window_id" IS NOT NULL AND "haex_desktop_items"."extension_id" IS NULL) OR ("haex_desktop_items"."item_type" = 'file' AND "haex_desktop_items"."system_window_id" IS NOT NULL AND "haex_desktop_items"."extension_id" IS NULL) OR ("haex_desktop_items"."item_type" = 'folder' AND "haex_desktop_items"."system_window_id" IS NOT NULL AND "haex_desktop_items"."extension_id" IS NULL))
+);
+--> statement-breakpoint
+CREATE TABLE `haex_extension_permissions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`extension_id` text NOT NULL,
+	`resource_type` text,
+	`action` text,
+	`target` text,
+	`constraints` text,
+	`status` text DEFAULT 'denied' NOT NULL,
+	`created_at` text DEFAULT (CURRENT_TIMESTAMP),
+	`updated_at` integer,
+	`haex_timestamp` text,
+	FOREIGN KEY (`extension_id`) REFERENCES `haex_extensions`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `haex_extension_permissions_extension_id_resource_type_action_target_unique` ON `haex_extension_permissions` (`extension_id`,`resource_type`,`action`,`target`);--> statement-breakpoint
+CREATE TABLE `haex_extensions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`public_key` text NOT NULL,
+	`name` text NOT NULL,
+	`version` text NOT NULL,
+	`author` text,
+	`description` text,
+	`entry` text DEFAULT 'index.html',
+	`homepage` text,
+	`enabled` integer DEFAULT true,
+	`icon` text,
+	`signature` text NOT NULL,
+	`single_instance` integer DEFAULT false,
+	`haex_timestamp` text
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `haex_extensions_public_key_name_unique` ON `haex_extensions` (`public_key`,`name`);--> statement-breakpoint
+CREATE TABLE `haex_notifications` (
+	`id` text PRIMARY KEY NOT NULL,
+	`alt` text,
+	`date` text,
+	`icon` text,
+	`image` text,
+	`read` integer,
+	`source` text,
+	`text` text,
+	`title` text,
+	`type` text NOT NULL,
+	`haex_timestamp` text
+);
+--> statement-breakpoint
+CREATE TABLE `haex_settings` (
+	`id` text PRIMARY KEY NOT NULL,
+	`key` text,
+	`type` text,
+	`value` text,
+	`haex_timestamp` text
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `haex_settings_key_type_value_unique` ON `haex_settings` (`key`,`type`,`value`);--> statement-breakpoint
+CREATE TABLE `haex_workspaces` (
+	`id` text PRIMARY KEY NOT NULL,
+	`device_id` text NOT NULL,
+	`name` text NOT NULL,
+	`position` integer DEFAULT 0 NOT NULL,
+	`haex_timestamp` text
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `haex_workspaces_position_unique` ON `haex_workspaces` (`position`);