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/note.controller.js

@@ -24,7 +24,7 @@ export const getAllNotes = async (req, res, next) => {
       data: notes,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -43,7 +43,7 @@ export const getNoteById = async (req, res, next) => {
       data: note,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -65,7 +65,7 @@ export const createNote = async (req, res, next) => {
       message: 'Poznámka bola vytvorená',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -87,7 +87,7 @@ export const updateNote = async (req, res, next) => {
       message: 'Poznámka bola aktualizovaná',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -106,7 +106,7 @@ export const deleteNote = async (req, res, next) => {
       message: result.message,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -126,7 +126,7 @@ export const getMyReminders = async (req, res, next) => {
       data: reminders,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -146,6 +146,6 @@ export const markReminderSent = async (req, res, next) => {
       message: 'Reminder označený ako odoslaný',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };