feat(db): split migrations into dialect-specific sqlite and postgres packages

backend/plugins/domain/user/migrations/sqlite/00001_initial.sql

@@ -0,0 +1,36 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS w_users (
+    id BIGINT PRIMARY KEY,
+    username VARCHAR(64) NOT NULL UNIQUE,
+    password VARCHAR(255),
+    nickname VARCHAR(255),
+    email VARCHAR(255),
+    avatar_url VARCHAR(255),
+    is_active BOOLEAN DEFAULT 1,
+    is_admin BOOLEAN DEFAULT 0,
+    bio VARCHAR(500),
+    phone VARCHAR(32),
+    gender VARCHAR(16),
+    website VARCHAR(255),
+    location VARCHAR(255),
+    last_login_at DATETIME,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_w_users_email ON w_users (email);
+CREATE INDEX IF NOT EXISTS idx_w_users_is_active ON w_users (is_active);
+CREATE INDEX IF NOT EXISTS idx_w_users_last_login_at ON w_users (last_login_at);
+CREATE INDEX IF NOT EXISTS idx_w_users_created_at ON w_users (created_at);
+
+-- Seed system user
+INSERT INTO w_users (id, username, password, nickname, avatar_url, is_active, is_admin, last_login_at, created_at, updated_at)
+VALUES (999, 'system', '*', '系统', '', 1, 0, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
+ON CONFLICT (username) DO NOTHING;
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DELETE FROM w_users WHERE username = 'system';
+DROP TABLE IF EXISTS w_users;
+-- +goose StatementEnd