Fix Pocket API calls - use POST method for all endpoints

- Change requests.get() to requests.post() for /v3/get endpoint
- Change requests.get() to requests.post() for /v3/stats endpoint
- Restore full progress bar functionality with total item count
- /v3/stats endpoint is functional but undocumented

The core issue was HTTP method, not deprecated endpoints.
All API calls now use POST as required by Pocket API.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: digithree

pocket_to_sqlite/utils.py

@@ -69,7 +69,7 @@ def ensure_fts(db):
 
 
 def fetch_stats(auth):
-    response = requests.get(
+    response = requests.post(
         "https://getpocket.com/v3/stats",
         {
             "consumer_key": auth["pocket_consumer_key"],
@@ -106,7 +106,7 @@ def __iter__(self):
             }
             if self.since is not None:
                 args["since"] = self.since
-            response = requests.get("https://getpocket.com/v3/get", args)
+            response = requests.post("https://getpocket.com/v3/get", args)
             if response.status_code == 503 and retries < 5:
                 print("Got a 503, retrying...")
                 retries += 1