🚦 fix: ERR_ERL_INVALID_IP_ADDRESS and IPv6 Key Collisions in IP Rate Limiters (#12319)

* fix: Add removePorts keyGenerator to all IP-based rate limiters

Six IP-based rate limiters are missing the `keyGenerator: removePorts`
option that is already used by the auth-related limiters (login,
register, resetPassword, verifyEmail). Without it, reverse proxies that
include ports in X-Forwarded-For headers cause
ERR_ERL_INVALID_IP_ADDRESS errors from express-rate-limit.

Fixes #12318

* fix: make removePorts IPv6-safe to prevent rate-limit key collisions

The original regex `/:\d+[^:]*$/` treated the last colon-delimited
segment of bare IPv6 addresses as a port, mangling valid IPs
(e.g. `::1` → `::`, `2001:db8::1` → `2001:db8::`). Distinct IPv6
clients could collapse into the same rate-limit bucket.

Use `net.isIP()` as a fast path for already-valid IPs, then match
bracketed IPv6+port and IPv4+port explicitly. Bare IPv6 addresses
are now returned unchanged.

Also fixes pre-existing property ordering inconsistency in
ttsLimiters.js userLimiterOptions (keyGenerator before store).

* refactor: move removePorts to packages/api as TypeScript, fix import order

- Move removePorts implementation to packages/api/src/utils/removePorts.ts
  with proper Express Request typing
- Reduce api/server/utils/removePorts.js to a thin re-export from
  @librechat/api for backward compatibility
- Consolidate removePorts import with limiterCache from @librechat/api
  in all 6 limiter files, fixing import order (package imports shortest
  to longest, local imports longest to shortest)
- Remove narrating inline comments per code style guidelines

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

api/server/utils/index.js

@@ -1,4 +1,3 @@
-const removePorts = require('./removePorts');
 const handleText = require('./handleText');
 const sendEmail = require('./sendEmail');
 const queue = require('./queue');
@@ -6,7 +5,6 @@ const files = require('./files');
 
 module.exports = {
   ...handleText,
-  removePorts,
   sendEmail,
   ...files,
   ...queue,

api/server/utils/removePorts.js

@@ -1 +0,0 @@
-module.exports = (req) => req?.ip?.replace(/:\d+[^:]*$/, '');