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/email-account.controller.js

@@ -17,7 +17,7 @@ export const getEmailAccounts = async (req, res, next) => {
       data: accounts,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -37,7 +37,7 @@ export const getEmailAccount = async (req, res, next) => {
       data: account,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -67,7 +67,7 @@ export const createEmailAccount = async (req, res, next) => {
       message: 'Email účet úspešne pripojený',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -93,7 +93,7 @@ export const updateEmailAccountPassword = async (req, res, next) => {
       message: 'Heslo k emailovému účtu bolo aktualizované',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -119,7 +119,7 @@ export const toggleEmailAccountStatus = async (req, res, next) => {
       message: `Email účet ${isActive ? 'aktivovaný' : 'deaktivovaný'}`,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -140,7 +140,7 @@ export const setPrimaryEmailAccount = async (req, res, next) => {
       message: 'Primárny email účet bol nastavený',
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };
 
@@ -161,6 +161,6 @@ export const deleteEmailAccount = async (req, res, next) => {
       message: result.message,
     });
   } catch (error) {
-    return next(error);
+    next(error);
   }
 };