fix: raise header limits and refresh dependencies

[Priveetee]

Summary

• increase Ktor Netty header ceiling by setting maxHeaderSize=65536 to remove backend HTTP header is larger than 8192 bytes failures on heavy channel pagination
• refresh backend dependencies on dev, including PipePipeExtractor (274ba4ddf31a7d39679f44be2db9cbdfc7986b20) and Kotlin/Ktor/runtime/test libraries
• keep production merge blocked pending explicit GO

Verification

• JAVA_HOME=/home/ark/.jdks/jdk-17.0.18+8 ./gradlew clean test
• JAVA_HOME=/home/ark/.jdks/jdk-17.0.18+8 ./gradlew test
• temporary runtime validation on local dev server (:18080):
  • Cookie ~9000 bytes -> 200
  • Cookie ~30000 bytes -> 200
  • Cookie ~70000 bytes -> 400 HTTP header is larger than 65536 bytes.