Update README and csv_uploader to match hardcoded field names

Remove --id-field and --seeding-field args from csv_uploader, hardcode
field names as class constants, and fix the same PATCH/GET bugs. Update
README examples to reflect simplified CLI args.

README.md

@@ -16,10 +16,8 @@ python seed_tracker.py \
   --id-folder ./torrents \
   --bt-backup ~/.local/share/qBittorrent/BT_backup \
   --nocodb-url https://noco.example.com \
-  --table-id tblXXXXX \
-  --api-token xc-xxxx \
-  --id-field cXXXXX \
-  --seeding-field cYYYYY
+  --table-id xxxxxxxxxxxxx \
+  --api-token xc-xxxx
 ```
 
 ### CSV Mode (outputs file for manual import)
@@ -38,10 +36,8 @@ python seed_tracker.py \
 | `--id-folder` | Yes | Folder containing `{id}.torrent` files |
 | `--bt-backup` | Yes | qBittorrent's `BT_backup` folder |
 | `--nocodb-url` | API mode | NocoDB base URL |
-| `--table-id` | API mode | Table ID (starts with `tbl`) |
+| `--table-id` | API mode | Table ID |
 | `--api-token` | API mode | API token (`xc-token`) |
-| `--id-field` | API mode | Field ID for Id column (starts with `c`) |
-| `--seeding-field` | API mode | Field ID for seeding_users column (starts with `c`) |
 | `--csv-only` | No | Skip API, output CSV instead |
 | `--output` | No | CSV output path (default: `seeding_update.csv`) |
 | `--debug` | No | Print API request/response details |
@@ -49,7 +45,6 @@ python seed_tracker.py \
 ## Finding NocoDB IDs
 
 - **Table ID**: Click `...` next to table name → Copy Table ID
-- **Field IDs**: Click field header dropdown → Copy Field ID
 
 ---
 
@@ -63,10 +58,8 @@ Uploads CSV files generated by others (via `--csv-only`) to NocoDB.
 python csv_uploader.py \
   --csv seeds.csv \
   --nocodb-url https://noco.example.com \
-  --table-id tblXXXXX \
-  --api-token xc-xxxx \
-  --id-field cXXXXX \
-  --seeding-field cYYYYY
+  --table-id xxxxxxxxxxxxx \
+  --api-token xc-xxxx
 ```
 
 ## Flags
@@ -77,5 +70,3 @@ python csv_uploader.py \
 | `--nocodb-url` | Yes | NocoDB base URL |
 | `--table-id` | Yes | Table ID |
 | `--api-token` | Yes | API token |
-| `--id-field` | Yes | Field ID for Id column |
-| `--seeding-field` | Yes | Field ID for seeding_users column |