refactor: Update RPC server main and entity ID handling

- Refactor `main` to spawn RPC server process
- Add `time` import for server startup delay
- Update `mydb.set` calls to use mutable object references
- Return entity ID from modified object after `set`

examples/hero/heromodels/openrpc.vsh

@@ -4,22 +4,28 @@ import json
 import freeflowuniverse.herolib.hero.heromodels.rpc
 import freeflowuniverse.herolib.schemas.jsonrpc
 import freeflowuniverse.herolib.hero.heromodels
+import time
 
 fn main() {
-	mut handler := rpc.new()!
+	spawn fn () ! {
+		println('starting server')
+		rpc.start(http_port: 9090) or { panic('Failed to start RPC server: ${err}') }
+	}()
 
-	my_calendar := heromodels.calendar_new(
-		name:           'My Calendar'
-		description:    'My Calendar'
-		securitypolicy: 1
-		tags:           ['tag1', 'tag2']
-		group_id:       1
-		events:         []u32{}
-		color:          '#000000'
-		timezone:       'UTC'
-		is_public:      true
-	)!
+	time.sleep(time.second * 3)
+	println('sleeping for 3 seconds to let server start')
+	// my_calendar := heromodels.calendar_new(
+	// 	name:           'My Calendar'
+	// 	description:    'My Calendar'
+	// 	securitypolicy: 1
+	// 	tags:           ['tag1', 'tag2']
+	// 	group_id:       1
+	// 	events:         []u32{}
+	// 	color:          '#000000'
+	// 	timezone:       'UTC'
+	// 	is_public:      true
+	// )!
 
-	response := handler.handle(jsonrpc.new_request('calendar_set', json.encode(my_calendar)))!
-	println(response)
+	// response := handler.handle(jsonrpc.new_request('calendar_set', json.encode(my_calendar)))!
+	// println(response)
 }

lib/hero/heromodels/rpc/rpc_calendar_event.v

@@ -81,9 +81,9 @@ pub fn calendar_event_set(request Request) !Response {
 		comments:       payload.comments
 	)!
 
-	id := mydb.calendar_event.set(calendar_event_obj)!
+	mydb.calendar_event.set(mut calendar_event_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, calendar_event_obj.id)
 }
 
 pub fn calendar_event_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_chat_group.v

@@ -59,9 +59,9 @@ pub fn chat_group_set(request Request) !Response {
 		comments:       payload.comments
 	)!
 
-	id := mydb.chat_group.set(chat_group_obj)!
+	mydb.chat_group.set(mut chat_group_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, chat_group_obj.id)
 }
 
 pub fn chat_group_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_chat_message.v

@@ -71,9 +71,9 @@ pub fn chat_message_set(request Request) !Response {
 		comments:        payload.comments
 	)!
 
-	id := mydb.chat_message.set(chat_message_obj)!
+	mydb.chat_message.set(mut chat_message_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, chat_message_obj.id)
 }
 
 pub fn chat_message_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_comment.v

@@ -48,9 +48,9 @@ pub fn comment_set(request Request) !Response {
 		author:  payload.author
 	)!
 
-	id := mydb.comments.set(comment_obj)!
+	mydb.comments.set(mut comment_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, comment_obj.id)
 }
 
 pub fn comment_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_group.v

@@ -54,9 +54,9 @@ pub fn group_set(request Request) !Response {
 		is_public:    payload.is_public
 	)!
 
-	id := mydb.group.set(group_obj)!
+	mydb.group.set(mut group_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, group_obj.id)
 }
 
 pub fn group_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_project.v

@@ -67,9 +67,9 @@ pub fn project_set(request Request) !Response {
 		comments:       payload.comments
 	)!
 
-	id := mydb.project.set(project_obj)!
+	mydb.project.set(mut project_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, project_obj.id)
 }
 
 pub fn project_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_project_issue.v

@@ -81,9 +81,9 @@ pub fn project_issue_set(request Request) !Response {
 		comments:       payload.comments
 	)!
 
-	id := mydb.project_issue.set(project_issue_obj)!
+	mydb.project_issue.set(mut project_issue_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, project_issue_obj.id)
 }
 
 pub fn project_issue_delete(request Request) !Response {

lib/hero/heromodels/rpc/rpc_user.v

@@ -68,9 +68,9 @@ pub fn user_set(request Request) !Response {
 		comments:       payload.comments
 	)!
 
-	id := mydb.user.set(user_obj)!
+	mydb.user.set(mut user_obj)!
 
-	return new_response_u32(request.id, id)
+	return new_response_u32(request.id, user_obj.id)
 }
 
 pub fn user_delete(request Request) !Response {