refactor: rename entry field to ip across whitelist API

Rename the `entry` field to `ip` throughout the whitelist API for
clarity and consistency. This affects API request/response bodies,
path parameters, OpenAPI spec, documentation, and database queries
in the audit log endpoint.

docs/api.md

@@ -79,7 +79,7 @@ Add a permanent whitelisted IP or CIDR range.
 
 ```json
 {
-  "entry": "1.2.3.4"
+  "ip": "1.2.3.4"
 }
 ```
 
@@ -91,7 +91,7 @@ Add a permanent whitelisted IP or CIDR range.
 curl -X POST http://127.0.0.1:8080/api/whitelist/perm \
   -H "Authorization: Bearer CHANGE_ME" \
   -H "Content-Type: application/json" \
-  -d '{"entry":"203.0.113.10"}'
+  -d '{"ip":"203.0.113.10"}'
 ```
 
 ### GET /api/whitelist/perm/list
@@ -112,7 +112,7 @@ List all currently active permanent whitelisted IPs.
 ```json
 [
   {
-    "entry": "203.0.113.10"
+    "ip": "203.0.113.10"
   }
 ]
 ```
@@ -124,7 +124,7 @@ curl -X GET "http://127.0.0.1:8080/api/whitelist/perm/list?limit=50&offset=0" \
   -H "Authorization: Bearer CHANGE_ME"
 ```
 
-### DELETE /api/whitelist/perm/{entry}
+### DELETE /api/whitelist/perm/{ip}
 
 Remove a permanent whitelisted IP or CIDR range.