fix(data): avoid duplicate user group migration version

crates/aether-data/migrations/sqlite/20260509120000_add_user_groups.sql

@@ -0,0 +1,51 @@
+ALTER TABLE users ADD COLUMN allowed_providers_mode TEXT NOT NULL DEFAULT 'unrestricted';
+ALTER TABLE users ADD COLUMN allowed_api_formats_mode TEXT NOT NULL DEFAULT 'unrestricted';
+ALTER TABLE users ADD COLUMN allowed_models_mode TEXT NOT NULL DEFAULT 'unrestricted';
+ALTER TABLE users ADD COLUMN rate_limit_mode TEXT NOT NULL DEFAULT 'system';
+
+UPDATE users
+SET allowed_providers_mode = CASE WHEN allowed_providers IS NULL THEN 'unrestricted' ELSE 'specific' END
+WHERE allowed_providers_mode = 'unrestricted';
+
+UPDATE users
+SET allowed_api_formats_mode = CASE WHEN allowed_api_formats IS NULL THEN 'unrestricted' ELSE 'specific' END
+WHERE allowed_api_formats_mode = 'unrestricted';
+
+UPDATE users
+SET allowed_models_mode = CASE WHEN allowed_models IS NULL THEN 'unrestricted' ELSE 'specific' END
+WHERE allowed_models_mode = 'unrestricted';
+
+UPDATE users
+SET rate_limit_mode = CASE WHEN rate_limit IS NULL THEN 'system' ELSE 'custom' END
+WHERE rate_limit_mode = 'system';
+
+CREATE TABLE IF NOT EXISTS user_groups (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    normalized_name TEXT NOT NULL UNIQUE,
+    description TEXT,
+    priority INTEGER NOT NULL DEFAULT 0,
+    allowed_providers TEXT,
+    allowed_providers_mode TEXT NOT NULL DEFAULT 'inherit',
+    allowed_api_formats TEXT,
+    allowed_api_formats_mode TEXT NOT NULL DEFAULT 'inherit',
+    allowed_models TEXT,
+    allowed_models_mode TEXT NOT NULL DEFAULT 'inherit',
+    rate_limit INTEGER,
+    rate_limit_mode TEXT NOT NULL DEFAULT 'inherit',
+    created_at INTEGER NOT NULL,
+    updated_at INTEGER NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS user_group_members (
+    group_id TEXT NOT NULL REFERENCES user_groups(id) ON DELETE CASCADE,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at INTEGER NOT NULL,
+    PRIMARY KEY (group_id, user_id)
+);
+
+CREATE INDEX IF NOT EXISTS user_group_members_user_id_idx
+    ON user_group_members (user_id);
+
+CREATE INDEX IF NOT EXISTS user_groups_priority_name_idx
+    ON user_groups (priority DESC, name ASC, id ASC);