feat: default locale Russian, geo determines language for other countries

- localization-svc: defaultLocale ru, resolveLocale only by geo
- web-svc: DEFAULT_LOCALE ru, layout lang=ru, embeddedTranslations fallback ru
- countryToLocale: default ru when no country or unknown country

Co-authored-by: Cursor <cursoragent@cursor.com>

services/library-svc/drizzle/0000_init.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS library_threads (
+  id TEXT PRIMARY KEY,
+  user_id TEXT NOT NULL,
+  title TEXT NOT NULL,
+  created_at TIMESTAMP DEFAULT NOW() NOT NULL,
+  sources JSONB DEFAULT '[]',
+  files JSONB DEFAULT '[]'
+);