fix: use ENABLE_FRONTEND_API/ENABLE_QT to gate e2e tests

Changed e2e test build condition from OBS::libobs to checking
ENABLE_FRONTEND_API OR ENABLE_QT. CI builds with both OFF don't
have full OBS headers installed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: rainmanjam

tests/CMakeLists.txt

@@ -622,10 +622,10 @@ set_tests_properties(
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
 )
 
-# E2E Streaming Workflow Tests (requires live Restreamer server AND OBS)
+# E2E Streaming Workflow Tests (requires live Restreamer server AND full OBS headers)
 # These tests compile restreamer-api.c which needs OBS headers
-# Only build when OBS is available (not in CI without OBS)
-if(TARGET OBS::libobs)
+# Only build when frontend/Qt is enabled (meaning full OBS SDK is available)
+if(ENABLE_FRONTEND_API OR ENABLE_QT)
 add_executable(test_e2e_streaming_workflow e2e/test_streaming_workflow.c obs_stubs.c)
 target_sources(
   test_e2e_streaming_workflow
@@ -655,12 +655,12 @@ set_tests_properties(
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     TIMEOUT 300
 )
-endif() # End if(TARGET OBS::libobs) for test_e2e_streaming_workflow
+endif() # End if(ENABLE_FRONTEND_API OR ENABLE_QT) for test_e2e_streaming_workflow
 
-# Comprehensive E2E Streaming Tests (requires live Restreamer server AND OBS)
+# Comprehensive E2E Streaming Tests (requires live Restreamer server AND full OBS headers)
 # These tests compile restreamer-api.c which needs OBS headers
-# Only build when OBS is available (not in CI without OBS)
-if(TARGET OBS::libobs)
+# Only build when frontend/Qt is enabled (meaning full OBS SDK is available)
+if(ENABLE_FRONTEND_API OR ENABLE_QT)
 add_executable(test_streaming_e2e e2e/test_streaming_e2e.c obs_stubs.c)
 target_sources(
   test_streaming_e2e
@@ -714,7 +714,7 @@ set_tests_properties(
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     TIMEOUT 600
 )
-endif() # End if(TARGET OBS::libobs) for test_streaming_e2e
+endif() # End if(ENABLE_FRONTEND_API OR ENABLE_QT) for test_streaming_e2e
 
 if(FALSE) # Temporarily disabled
   # End-to-End workflow tests