feat: auth system, scrip scheduler, UI widgets, and new API routes

- Add session-based authentication (login page, middleware, auth context)
- Add cron-like scrip scheduler for time-based conditions
- Add layout builder, scrip wizard, searchable select components
- Add trend chart widget for dashboards
- Add notifications, attachments, queue-permissions API routes
- Add seed-users script
- Update schema with 10 new migrations (0008-0017)
- Apply redesign: Linear-inspired dark theme, conversation-centric UI
- Gitignore runtime data directory

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

drizzle/migrations/0016_famous_maximus.sql

@@ -0,0 +1,12 @@
+CREATE TABLE "api_tokens" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"user_id" uuid NOT NULL,
+	"name" text NOT NULL,
+	"token_hash" text NOT NULL,
+	"last_used_at" timestamp with time zone,
+	"created_at" timestamp with time zone DEFAULT now(),
+	CONSTRAINT "api_tokens_token_hash_unique" UNIQUE("token_hash")
+);
+--> statement-breakpoint
+ALTER TABLE "api_tokens" ADD CONSTRAINT "api_tokens_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "api_tokens_user_id_idx" ON "api_tokens" USING btree ("user_id");