fix: surface actual error message when service installation fails

Backend returned { error: message } on 400 but frontend expected { message }.
catchInternal swallowed Axios errors and returned undefined, causing a
generic 'An internal error occurred' message instead of the real reason
(already installed, already in progress, not found).

- Fix 400 response shape to { success: false, message } in controller
- Replace catchInternal with direct error handling in installService,
  affectService, and forceReinstallService API methods
- Extract error.response.data.message from Axios errors so callers
  see the actual server message

admin/app/controllers/system_controller.ts

@@ -35,7 +35,7 @@ export default class SystemController {
         if (result.success) {
             response.send({ success: true, message: result.message });
         } else {
-            response.status(400).send({ error: result.message });
+            response.status(400).send({ success: false, message: result.message });
         }
     }
 

admin/inertia/lib/api.ts

@@ -1,4 +1,4 @@
-import axios, { AxiosInstance } from 'axios'
+import axios, { AxiosError, AxiosInstance } from 'axios'
 import { ListRemoteZimFilesResponse, ListZimFilesResponse } from '../../types/zim'
 import { ServiceSlim } from '../../types/services'
 import { FileEntry } from '../../types/files'
@@ -25,13 +25,19 @@ class API {
   }
 
   async affectService(service_name: string, action: 'start' | 'stop' | 'restart') {
-    return catchInternal(async () => {
+    try {
       const response = await this.client.post<{ success: boolean; message: string }>(
         '/system/services/affect',
         { service_name, action }
       )
       return response.data
-    })()
+    } catch (error) {
+      if (error instanceof AxiosError && error.response?.data?.message) {
+        return { success: false, message: error.response.data.message }
+      }
+      console.error('Error affecting service:', error)
+      return undefined
+    }
   }
 
   async checkLatestVersion(force: boolean = false) {
@@ -192,13 +198,19 @@ class API {
   }
 
   async forceReinstallService(service_name: string) {
-    return catchInternal(async () => {
+    try {
       const response = await this.client.post<{ success: boolean; message: string }>(
         `/system/services/force-reinstall`,
         { service_name }
       )
       return response.data
-    })()
+    } catch (error) {
+      if (error instanceof AxiosError && error.response?.data?.message) {
+        return { success: false, message: error.response.data.message }
+      }
+      console.error('Error force reinstalling service:', error)
+      return undefined
+    }
   }
 
   async getChatSuggestions(signal?: AbortSignal) {
@@ -452,13 +464,19 @@ class API {
   }
 
   async installService(service_name: string) {
-    return catchInternal(async () => {
+    try {
       const response = await this.client.post<{ success: boolean; message: string }>(
         '/system/services/install',
         { service_name }
       )
       return response.data
-    })()
+    } catch (error) {
+      if (error instanceof AxiosError && error.response?.data?.message) {
+        return { success: false, message: error.response.data.message }
+      }
+      console.error('Error installing service:', error)
+      return undefined
+    }
   }
 
   async listCuratedMapCollections() {