fix(skills): add database storage for skills on serverless (Vercel)

- Add skills table to Postgres and SQLite schemas
- Create PgSkillStore for database-backed skill storage
- Update /api/skills/catalog to use DB storage on serverless
- Update /api/skills to load skills from DB on serverless
- Generate database migrations for both Postgres and SQLite

Fixes #19

Author: phodal

drizzle-sqlite/0000_natural_miracleman.sql

@@ -0,0 +1,123 @@
+CREATE TABLE `acp_sessions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`name` text,
+	`cwd` text NOT NULL,
+	`workspace_id` text NOT NULL,
+	`routa_agent_id` text,
+	`provider` text,
+	`role` text,
+	`mode_id` text,
+	`first_prompt_sent` integer DEFAULT false,
+	`message_history` text DEFAULT '[]',
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `agents` (
+	`id` text PRIMARY KEY NOT NULL,
+	`name` text NOT NULL,
+	`role` text NOT NULL,
+	`model_tier` text DEFAULT 'SMART' NOT NULL,
+	`workspace_id` text NOT NULL,
+	`parent_id` text,
+	`status` text DEFAULT 'PENDING' NOT NULL,
+	`metadata` text DEFAULT '{}',
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`workspace_id`) REFERENCES `workspaces`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `event_subscriptions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`agent_id` text NOT NULL,
+	`agent_name` text NOT NULL,
+	`event_types` text NOT NULL,
+	`exclude_self` integer DEFAULT true NOT NULL,
+	`one_shot` integer DEFAULT false NOT NULL,
+	`wait_group_id` text,
+	`priority` integer DEFAULT 0 NOT NULL,
+	`created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `messages` (
+	`id` text PRIMARY KEY NOT NULL,
+	`agent_id` text NOT NULL,
+	`role` text NOT NULL,
+	`content` text NOT NULL,
+	`timestamp` integer NOT NULL,
+	`tool_name` text,
+	`tool_args` text,
+	`turn` integer
+);
+--> statement-breakpoint
+CREATE TABLE `notes` (
+	`id` text NOT NULL,
+	`workspace_id` text NOT NULL,
+	`title` text NOT NULL,
+	`content` text DEFAULT '' NOT NULL,
+	`type` text DEFAULT 'general' NOT NULL,
+	`task_status` text,
+	`assigned_agent_ids` text,
+	`parent_note_id` text,
+	`linked_task_id` text,
+	`custom_metadata` text,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`workspace_id`) REFERENCES `workspaces`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `pending_events` (
+	`id` text PRIMARY KEY NOT NULL,
+	`agent_id` text NOT NULL,
+	`event_type` text NOT NULL,
+	`source_agent_id` text NOT NULL,
+	`workspace_id` text NOT NULL,
+	`data` text DEFAULT '{}',
+	`timestamp` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `skills` (
+	`id` text PRIMARY KEY NOT NULL,
+	`name` text NOT NULL,
+	`description` text DEFAULT '' NOT NULL,
+	`source` text NOT NULL,
+	`catalog_type` text DEFAULT 'skillssh' NOT NULL,
+	`files` text DEFAULT '[]' NOT NULL,
+	`license` text,
+	`metadata` text DEFAULT '{}',
+	`installs` integer DEFAULT 0 NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `tasks` (
+	`id` text PRIMARY KEY NOT NULL,
+	`title` text NOT NULL,
+	`objective` text NOT NULL,
+	`scope` text,
+	`acceptance_criteria` text,
+	`verification_commands` text,
+	`assigned_to` text,
+	`status` text DEFAULT 'PENDING' NOT NULL,
+	`dependencies` text DEFAULT '[]',
+	`parallel_group` text,
+	`workspace_id` text NOT NULL,
+	`completion_summary` text,
+	`verification_verdict` text,
+	`verification_report` text,
+	`version` integer DEFAULT 1 NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`workspace_id`) REFERENCES `workspaces`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `workspaces` (
+	`id` text PRIMARY KEY NOT NULL,
+	`title` text NOT NULL,
+	`repo_path` text,
+	`branch` text,
+	`status` text DEFAULT 'active' NOT NULL,
+	`metadata` text DEFAULT '{}',
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);