Add scheduled tasks with a Project tab section and lead tools

internal/store/migrations/096-add-schedules.sql

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+CREATE TABLE schedules (
+	id TEXT PRIMARY KEY,
+	project_id TEXT NOT NULL REFERENCES projects(id),
+	owner TEXT NOT NULL REFERENCES users(login),
+	title TEXT NOT NULL,
+	every TEXT NOT NULL CHECK (every IN ('hour', 'day', 'week', 'month')),
+	hour INTEGER NOT NULL CHECK (hour BETWEEN 0 AND 23),
+	minute INTEGER NOT NULL CHECK (minute BETWEEN 0 AND 59),
+	day_of_month INTEGER NOT NULL CHECK (day_of_month BETWEEN 0 AND 31),
+	prompt TEXT NOT NULL,
+	model TEXT NOT NULL,
+	workflow TEXT NOT NULL,
+	next_run_at TEXT NOT NULL,
+	created_at TEXT NOT NULL
+);
+
+CREATE INDEX schedules_by_next_run ON schedules (next_run_at);
+
+CREATE TABLE schedule_weekdays (
+	schedule_id TEXT NOT NULL REFERENCES schedules(id),
+	weekday TEXT NOT NULL CHECK (weekday IN ('mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun')),
+	PRIMARY KEY (schedule_id, weekday)
+);