[2748109647]

Summary

• Add dapr.actors.transport with HTTP as the default. When set to grpc, start the actor event subscription after ApplicationReadyEvent, after application runners have registered actor types.
• Expose the started ActorEventSubscription as a bean and close it when the application context shuts down.
• Add auto-configuration tests for the default HTTP behavior, gRPC property binding, startup, bean exposure, and shutdown.
• Add a Spring Boot actor host integration test that runs daprd without an app port, and document the configuration and protocol requirements.

Fixes #1839

Validation

• Focused auto-configuration tests passed: 2 tests, 0 failures.
• Checkstyle passed with 0 violations.
• All sdk-tests integration test sources compiled, including SpringBootActorGrpcIT.
• The container-backed integration test was not run locally because Docker is unavailable in this environment.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.11%. Comparing base (15bec05) to head (71be166).

Files with missing lines	Patch %	Lines
...ng/boot/properties/actors/DaprActorProperties.java	0.00%	8 Missing ⚠️
...re/actors/DaprActorEventSubscriptionLifecycle.java	66.66%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1869      +/-   ##
============================================
- Coverage     80.21%   80.11%   -0.11%     
- Complexity     2801     2806       +5     
============================================
  Files           273      276       +3     
  Lines          8278     8306      +28     
  Branches        896      896              
============================================
+ Hits           6640     6654      +14     
- Misses         1272     1284      +12     
- Partials        366      368       +2     

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