chore: kanban template

sql/0001-init.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS kanban_card (
+  card_id TEXT PRIMARY KEY,
+  title TEXT NOT NULL,
+  description TEXT,
+  status TEXT NOT NULL DEFAULT 'todo',
+  priority TEXT NOT NULL DEFAULT 'medium',
+  position INTEGER NOT NULL DEFAULT 0,
+  due_at TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS kanban_card_status_idx ON kanban_card(status);