Remove generated files from git tracking

- Add api/proto/generated/ to .gitignore (protobuf generated files)
- Add internal/ent/ and ent/ to .gitignore (Ent ORM generated files)
- Remove all generated files from git tracking
- Generated files can be regenerated with 'make generate-proto' and 'make generate-ent'

ent/schema/auditlog.go

@@ -1,19 +0,0 @@
-// Package schema defines the Ent schema for audit log entities.
-package schema
-
-import "entgo.io/ent"
-
-// AuditLog holds the schema definition for the AuditLog entity.
-type AuditLog struct {
-	ent.Schema
-}
-
-// Fields of the AuditLog.
-func (AuditLog) Fields() []ent.Field {
-	return nil
-}
-
-// Edges of the AuditLog.
-func (AuditLog) Edges() []ent.Edge {
-	return nil
-}