chore: harden common storage bootstrap and slim embedded db assets

Unify embedding config, build providers from system settings, and fail
startup when index builds error or time out. Move Surreal assets under
common/db so embeds exclude crate source, and read storage via streams.

common/db/schemas/analytics.surql

@@ -0,0 +1,7 @@
+# Defines the schema for the 'analytics' table.
+
+DEFINE TABLE IF NOT EXISTS analytics SCHEMALESS;
+
+# Custom fields from the Analytics struct
+DEFINE FIELD IF NOT EXISTS page_loads ON analytics TYPE number;
+DEFINE FIELD IF NOT EXISTS visitors ON analytics TYPE number;