Set default page size from environment variable

Replaced the hardcoded page size with a value fetched from the `SWISSDOX_PAGESIZE` environment variable, defaulting to 10 if not set. This allows greater flexibility and configurability for pagination settings.

src/phoenix_technologies/smd/server.py

@@ -80,7 +80,7 @@ async def smd_research(search_query: str = "Bundesrat", date_from: str = "2024-0
         ],
         "exact": False,
         "pagination": {
-            "pageSize": 25,
+            "pageSize": os.getenv('SWISSDOX_PAGESIZE', '10'),
             "currentPage": 1
         },
         "onlyResults": False