Code quality improvements from code review

- Add admin-only authorization for company and projects CRUD operations
- Create requireAccountId middleware to eliminate code duplication
- Standardize error handling (use next(error) consistently)
- Change error messages to Slovak language

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/controllers/todo.controller.js

@@ -32,7 +32,7 @@ export const getAllTodos = async (req, res, next) => {
       data: todos,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -58,7 +58,7 @@ export const getMyTodos = async (req, res, next) => {
       data: todos,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -77,7 +77,7 @@ export const getTodoById = async (req, res, next) => {
       data: todo,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -96,7 +96,7 @@ export const getTodoWithRelations = async (req, res, next) => {
       data: todo,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -121,7 +121,7 @@ export const createTodo = async (req, res, next) => {
       message: 'Todo bolo vytvorené',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -143,7 +143,7 @@ export const updateTodo = async (req, res, next) => {
       message: 'Todo bolo aktualizované',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -170,7 +170,7 @@ export const deleteTodo = async (req, res, next) => {
       message: result.message,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -203,6 +203,6 @@ export const toggleTodo = async (req, res, next) => {
       message: 'Todo status aktualizovaný',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };