chore: remove auth rate limiting

Vector is an internal service — throttling /api/auth requests provides
no meaningful protection and gets in the way of legitimate use. Drops
the express-rate-limit middleware and dependency.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -41,9 +41,6 @@ importers:
       express:
         specifier: ^5.2.1
         version: 5.2.1
-      express-rate-limit:
-        specifier: ^8.3.2
-        version: 8.3.2(express@5.2.1)
       helmet:
         specifier: ^8.1.0
         version: 8.1.0
@@ -1936,12 +1933,6 @@ packages:
     resolution: {integrity: sha512-knvyeauYhqjOYvQ66MznSMs83wmHrCycNEN6Ao+2AeYEfxUIkuiVxdEa1qlGEPK+We3n0THiDciYSsCcgW/DoA==}
     engines: {node: '>=12.0.0'}
 
-  express-rate-limit@8.3.2:
-    resolution: {integrity: sha512-77VmFeJkO0/rvimEDuUC5H30oqUC4EyOhyGccfqoLebB0oiEYfM7nwPrsDsBL1gsTpwfzX8SFy2MT3TDyRq+bg==}
-    engines: {node: '>= 16'}
-    peerDependencies:
-      express: '>= 4.11'
-
   express@5.2.1:
     resolution: {integrity: sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==}
     engines: {node: '>= 18'}
@@ -2138,10 +2129,6 @@ packages:
     resolution: {integrity: sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg==}
     engines: {node: '>=12'}
 
-  ip-address@10.1.0:
-    resolution: {integrity: sha512-XXADHxXmvT9+CRxhXg56LJovE+bmWnEWB78LB83VZTprKTmaC5QfruXocxzTZ2Kl0DNwKuBdlIhjL8LeY8Sf8Q==}
-    engines: {node: '>= 12'}
-
   ipaddr.js@1.9.1:
     resolution: {integrity: sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g==}
     engines: {node: '>= 0.10'}
@@ -4572,11 +4559,6 @@ snapshots:
 
   expect-type@1.3.0: {}
 
-  express-rate-limit@8.3.2(express@5.2.1):
-    dependencies:
-      express: 5.2.1
-      ip-address: 10.1.0
-
   express@5.2.1:
     dependencies:
       accepts: 2.0.0
@@ -4778,8 +4760,6 @@ snapshots:
 
   internmap@2.0.3: {}
 
-  ip-address@10.1.0: {}
-
   ipaddr.js@1.9.1: {}
 
   is-extglob@2.1.1: {}