feat(api): add activities + work_sessions domain schema and shared contracts

apps/api/drizzle/0001_common_leopardon.sql

@@ -0,0 +1,26 @@
+CREATE TABLE `activities` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`insole_types` text DEFAULT '["Kurk","Berk","3D"]' NOT NULL,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `work_sessions` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`user_id` text NOT NULL,
+	`activity_id` integer NOT NULL,
+	`insole_type` text,
+	`pair_count` integer DEFAULT 2 NOT NULL,
+	`start_time` integer NOT NULL,
+	`end_time` integer,
+	`duration_seconds` integer,
+	`status` text DEFAULT 'active' NOT NULL,
+	`source` text DEFAULT 'app' NOT NULL,
+	`notes` text,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`activity_id`) REFERENCES `activities`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE INDEX `work_sessions_userId_idx` ON `work_sessions` (`user_id`);--> statement-breakpoint
+CREATE INDEX `work_sessions_startTime_idx` ON `work_sessions` (`start_time`);