Add support for inverter current caps in site configuration

- Introduced `InverterModbusCurrentCapsBody` model for updating max charge and discharge currents.
- Updated SQL queries to utilize `COALESCE` for effective current limits.
- Modified relevant tests to reflect changes in battery current handling.
- Added new SQL migration for `deye_register_max_current_a` columns in the database.

.idea/sqldialects.xml

@@ -2,7 +2,5 @@
 <project version="4">
   <component name="SqlDialectMappings">
     <file url="file://$PROJECT_DIR$/../ems-cursor-db-pracovni/porovnani-view-status.sql" dialect="PostgreSQL" />
-    <file url="file://$PROJECT_DIR$/db/migration/V009__postgrest_roles.sql" dialect="PostgreSQL" />
-    <file url="file://$PROJECT_DIR$/db/views/R__z_postgrest_ems_anon_grants.sql" dialect="PostgreSQL" />
   </component>
 </project>