fix: add timeout=30 to requests.get() in futurerate.py and octopus.py to prevent silent TCP stalls from hanging the main loop indefinitely

Fixes #4525 - a stalled Nord Pool connection would block the main prediction
loop forever. With timeout=30, the existing exception handler will catch
requests.exceptions.Timeout and fall back to cached rates via the existing
retry logic.

Also adds timeout to octopus.py download_octopus_free_func() which had the
same pattern.

Co-authored-by: springfall2008 <48591903+springfall2008@users.noreply.github.com>

Author: Copilot

apps/predbat/futurerate.py

@@ -412,7 +412,7 @@ def download_futurerate_data(self, url):
 
     def download_futurerate_data_func(self, url):
         try:
-            r = requests.get(url)
+            r = requests.get(url, timeout=30)
         except Exception as e:
             self.log("Warn: Error downloading futurerate data from URL {}, request exception {}".format(url, e))
             self.record_status("Warn: Error downloading futurerate data from cloud", debug=url, had_errors=True)

apps/predbat/octopus.py

@@ -2066,7 +2066,7 @@ def download_octopus_free_func(self, url):
         Download octopus free session data directly from a URL, no caching.
         """
         try:
-            r = requests.get(url)
+            r = requests.get(url, timeout=30)
         except requests.exceptions.ConnectionError:
             self.log("Warn: Octopus: Unable to download Octopus data from URL {} (ConnectionError)".format(url))
             self.record_status("Warn: Unable to download Octopus free session data", debug=url, had_errors=True)