fix(database): env var for db_name is NAME not DB_NAME

Rename field `db_name` to `name` in `DatabaseSettings` so pydantic-settings
constructs the env var as `{PREFIX}NAME` (e.g. `MYAPP_DB_NAME`) instead of
the confusing double-prefix `{PREFIX}DB_NAME`.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: olivermeyer

ATTRIBUTIONS.md

@@ -360,7 +360,7 @@ SOFTWARE.
 
 ```
 
-## aignostics-foundry-core (0.5.0) - MIT License
+## aignostics-foundry-core (0.6.1) - MIT License
 
 🏭 Foundational infrastructure for Foundry components.