Clean up unused code and config

Remove PROCESSED_FILE references and update .env.example with placeholder
Uptime URLs for privacy.

Changes:
- Remove unused processed_file variable and loading in main.py
- Update .env.example to use generic Uptime URLs
- Remove processed_uids.txt from .gitignore

.env.example

@@ -7,7 +7,6 @@ DEST_PORT=993
 DEST_USER=your@mxroute.com
 DEST_PASS=password
 FOLDER=INBOX
-PROCESSED_FILE=processed_uids.txt
 DRY_RUN=false
-UPTIME_SUCCESS_URL=https://uptime.jeena.net/api/push/aUC76G2mpY?status=up&msg=OK&ping=
-UPTIME_FAIL_URL=https://uptime.jeena.net/api/push/aUC76G2mpY?status=down&msg=Failed
+UPTIME_SUCCESS_URL=https://your-uptime-instance.com/api/push/your-token?status=up&msg=OK&ping=
+UPTIME_FAIL_URL=https://your-uptime-instance.com/api/push/your-token?status=down&msg=Failed

.gitignore

@@ -136,6 +136,5 @@ dmypy.json
 .ruff_cache/
 
 # Local data
-processed_uids.txt
 processed_message_ids.txt
 last_run.txt

main.py

@@ -34,7 +34,6 @@ dest_pass = os.getenv("DEST_PASS")
 if not dest_pass:
     raise ValueError("DEST_PASS not set")
 folder = os.getenv("FOLDER", "INBOX")
-processed_file = os.getenv("PROCESSED_FILE", "processed_uids.txt")
 processed_msg_file = "processed_message_ids.txt"
 last_run_file = "last_run.txt"
 dry_run = os.getenv("DRY_RUN", "false").lower() == "true"