[whuerboy]

Which Issue(s) This PR Fixes

Related issue: #11518 .

Brief Description

Starting NameServer and Broker from source in IntelliJ IDEA requires manually configuring launch parameters, local storage paths, and protocol source generation.

This PR provides shared run configurations and documentation to simplify local startup and debugging:

• Add Source - NameServer and Source - Broker run configurations with project-relative paths and Maven compilation before launch.
• Add local server configuration files with reduced resource limits and runtime data stored under devenv/idea/.
• Register the generated Protobuf and gRPC Java source directories in rocketmq-proto/pom.xml for IDE Maven import.
• Document JDK 17 setup, protocol submodule initialization, startup order, client configuration, and troubleshooting.
• Link the debugging guide from CONTRIBUTING.md.

How Did You Test This Change?

Validation pending:

• Compile NameServer, Broker, and their dependencies with JDK 17.
• Reload the Maven project in IntelliJ IDEA and verify that generated protocol sources are recognized.
• Launch NameServer and Broker using the shared run configurations.
• Confirm that Broker registers successfully with NameServer.
• Send and consume a test message through 127.0.0.1:9876.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.79%. Comparing base (0e48015) to head (9d7c13a).
⚠️ Report is 15 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #11517      +/-   ##
=============================================
+ Coverage      49.74%   49.79%   +0.05%     
- Complexity     14368    14406      +38     
=============================================
  Files           1390     1391       +1     
  Lines         103262   103381     +119     
  Branches       13503    13529      +26     
=============================================
+ Hits           51365    51481     +116     
+ Misses         45703    45689      -14     
- Partials        6194     6211      +17     

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