fix(jetbrains): include JetBrains in repo typecheck/tests and fix serialization failures

Re-enable @kilocode/kilo-jetbrains in bun turbo typecheck (package.json) and
bun turbo test:ci (test.yml). Add Java 21 setup to the typecheck workflow so
Gradle can run. Fix three serialization test failures:

- KiloProfile200Response with null balance / with organizations: Effect's HttpApi
  OpenAPI generator emits balance and currentOrgId as non-nullable even though
  the server schema uses Schema.NullOr. Add fixProfileNullable step to
  OpenApiSpecNormalizer that wraps these fields in anyOf: [{schema}, {type:null}]
  before Kotlin client generation, plus regression tests.

- model limit context and output deserialize with large values (NoSuchMethodError):
  compileTestKotlin was not invalidated when the generated API type changed, leaving
  stale bytecode referencing the old ProviderConfigModelsValueAnyOfLimit class.
  Wire compileTestKotlin -> fixGeneratedApi in backend/build.gradle.kts so API
  regeneration always invalidates test compilation.

.github/workflows/test.yml

@@ -82,7 +82,7 @@ jobs:
             turbo-${{ runner.os }}-
 
       - name: Run unit tests
-        run: bun turbo test:ci --filter=!@kilocode/kilo-jetbrains # kilocode_change
+        run: bun turbo test:ci
         env:
           KILO_EXPERIMENTAL_DISABLE_FILEWATCHER: ${{ runner.os == 'Windows' && 'true' || 'false' }}
 

.github/workflows/typecheck.yml

@@ -17,5 +17,13 @@ jobs:
       - name: Setup Bun
         uses: ./.github/actions/setup-bun
 
+      # kilocode_change start
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+      # kilocode_change end
+
       - name: Run typecheck
         run: bun typecheck