Fix: Add PHP 7.4 compatibility

- Changed PHP min-version from 8.0 to 7.4 in appinfo/info.xml
- Replaced all str_contains() calls with strpos() !== false
  - GoogleAnalyticsService.php: 1 instance
  - LLMService.php: 6 instances
- Verified no other PHP 8.0+ features in use
- Plugin now compatible with PHP 7.4 and PHP 8.0+

analytics-hub/appinfo/info.xml

@@ -22,7 +22,7 @@
   <category>integration</category>
   <dependencies>
     <nextcloud min-version="25" max-version="26"/>
-    <php min-version="8.0"/>
+    <php min-version="7.4"/>
   </dependencies>
   <repair-steps>
   <step>Repair steps not needed</step>

analytics-hub/lib/Service/GoogleAnalyticsService.php

@@ -176,7 +176,7 @@ class GoogleAnalyticsService {
             $this->logger->error("Token refresh failed: {$e->getMessage()}");
 
             // Check if it's an expired token error
-            if (str_contains($e->getMessage(), 'invalid_grant')) {
+            if (strpos($e->getMessage(), 'invalid_grant') !== false) {
                 throw new TokenExpiredException('Refresh token expired - re-run OAuth setup');
             }
 

analytics-hub/lib/Service/LLMService.php

@@ -136,9 +136,9 @@ PROMPT;
                 $errorMessage = $e->getMessage();
 
                 // Check for rate limit
-                if (str_contains($errorMessage, 'rate_limit') ||
-                    str_contains($errorMessage, '429') ||
-                    str_contains($errorMessage, 'too_many_requests')) {
+                if (strpos($errorMessage, 'rate_limit') !== false ||
+                    strpos($errorMessage, '429') !== false ||
+                    strpos($errorMessage, 'too_many_requests') !== false) {
 
                     $this->logger->warning("Rate limited, waiting " . self::RATE_LIMIT_DELAY . "s");
 
@@ -151,9 +151,9 @@ PROMPT;
                 }
 
                 // Check for timeout
-                if (str_contains($errorMessage, 'timeout') ||
-                    str_contains($errorMessage, 'connection') ||
-                    str_contains($errorMessage, 'timed out')) {
+                if (strpos($errorMessage, 'timeout') !== false ||
+                    strpos($errorMessage, 'connection') !== false ||
+                    strpos($errorMessage, 'timed out') !== false) {
 
                     if ($attempt < self::MAX_RETRIES - 1) {
                         $this->logger->warning("Timeout, retrying...");
@@ -235,7 +235,7 @@ PROMPT;
             throw new \Exception('Response too short - likely error');
         }
 
-        if (!str_contains($response, '# Weekly Analytics Snapshot')) {
+        if (strpos($response, '# Weekly Analytics Snapshot') === false) {
             throw new \Exception('Missing required format');
         }
     }