chore: auto-commit (28 archivos)

- app.md
- auth.go
- chat.go
- chat.log
- db.go
- frontend/package.json
- frontend/pnpm-lock.yaml
- frontend/src/App.tsx
- frontend/src/Root.tsx
- frontend/src/api.ts
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

migrations/001_init.sql

@@ -4,6 +4,7 @@ CREATE TABLE IF NOT EXISTS columns (
     position    INTEGER NOT NULL DEFAULT 0,
     location    TEXT NOT NULL DEFAULT 'board' CHECK(location IN ('board','sidebar')),
     width       INTEGER NOT NULL DEFAULT 300,
+    wip_limit   INTEGER NOT NULL DEFAULT 0,
     created_at  TEXT NOT NULL
 );
 
@@ -15,6 +16,7 @@ CREATE TABLE IF NOT EXISTS cards (
     color       TEXT NOT NULL DEFAULT '',
     column_id   TEXT NOT NULL REFERENCES columns(id) ON DELETE CASCADE,
     position    INTEGER NOT NULL DEFAULT 0,
+    locked      INTEGER NOT NULL DEFAULT 0,
     created_at  TEXT NOT NULL,
     updated_at  TEXT NOT NULL
 );
@@ -27,7 +29,23 @@ CREATE TABLE IF NOT EXISTS card_column_history (
     exited_at  TEXT
 );
 
+CREATE TABLE IF NOT EXISTS card_lock_history (
+    id         TEXT PRIMARY KEY,
+    card_id    TEXT NOT NULL REFERENCES cards(id) ON DELETE CASCADE,
+    locked_at  TEXT NOT NULL,
+    unlocked_at TEXT
+);
+
+CREATE TABLE IF NOT EXISTS users (
+    id            TEXT PRIMARY KEY,
+    username      TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL,
+    display_name  TEXT NOT NULL DEFAULT '',
+    created_at    TEXT NOT NULL
+);
+
 CREATE INDEX IF NOT EXISTS idx_cards_column ON cards(column_id);
 CREATE INDEX IF NOT EXISTS idx_cards_position ON cards(column_id, position);
 CREATE INDEX IF NOT EXISTS idx_history_card ON card_column_history(card_id);
 CREATE INDEX IF NOT EXISTS idx_columns_position ON columns(position);
+CREATE INDEX IF NOT EXISTS idx_lock_history_card ON card_lock_history(card_id);