refactor: rename aris to aelis

Rename all references across the codebase: package names,
imports, source IDs, directory names, docs, and configs.

Co-authored-by: Ona <no-reply@ona.com>

apps/aelis-backend/.env.example

@@ -0,0 +1,14 @@
+# PostgreSQL connection string
+DATABASE_URL=postgresql://user:password@localhost:5432/aris
+
+# BetterAuth secret (min 32 chars, generate with: openssl rand -base64 32)
+BETTER_AUTH_SECRET=
+
+# Base URL of the backend
+BETTER_AUTH_URL=http://localhost:3000
+
+# Apple WeatherKit credentials
+WEATHERKIT_PRIVATE_KEY=
+WEATHERKIT_KEY_ID=
+WEATHERKIT_TEAM_ID=
+WEATHERKIT_SERVICE_ID=