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/meeting.controller.js

@@ -20,7 +20,7 @@ export const getMeetingsByMonth = async (req, res, next) => {
       data: meetings,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -39,7 +39,7 @@ export const getMeetingById = async (req, res, next) => {
       data: meeting,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -60,7 +60,7 @@ export const createMeeting = async (req, res, next) => {
       message: 'Meeting bol vytvorený',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -81,7 +81,7 @@ export const updateMeeting = async (req, res, next) => {
       message: 'Meeting bol upravený',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -100,6 +100,6 @@ export const deleteMeeting = async (req, res, next) => {
       message: result.message,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };