refactor: rename C++-style m_/s_ field prefixes to Java camelCase

[shalk]

apollo-core and apollo-client carried a legacy Ctrip/C++ (Hungarian notation) field naming convention using m_/s_ prefixes, inconsistent with idiomatic Java. Strip the prefixes across both modules' main and test sources, and update the handful of cross-module reflection lookups (mockserver, log4j2 plugin, config-data, compat-tests) that referenced the old field names by string literal.

What's the purpose of this PR

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Which issue(s) this PR fixes:

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Brief changelog

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[codecov]

Codecov Report

❌ Patch coverage is 83.01527% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.54%. Comparing base (d4b76f8) to head (d74cdbb).
⚠️ Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
...internals/provider/DefaultApplicationProvider.java	55.55%	12 Missing and 4 partials ⚠️
...rip/framework/apollo/internals/AbstractConfig.java	83.58%	0 Missing and 11 partials ⚠️
...java/com/ctrip/framework/apollo/ConfigService.java	65.38%	6 Missing and 3 partials ⚠️
...tion/internals/provider/DefaultServerProvider.java	75.75%	6 Missing and 2 partials ⚠️
.../apollo/internals/RemoteConfigLongPollService.java	82.50%	2 Missing and 5 partials ⚠️
.../foundation/internals/NetworkInterfaceManager.java	50.00%	4 Missing and 2 partials ⚠️
...framework/apollo/internals/AbstractConfigFile.java	87.50%	1 Missing and 2 partials ⚠️
...ork/apollo/internals/ConfigMonitorInitializer.java	57.14%	0 Missing and 3 partials ⚠️
...rk/apollo/internals/LocalFileConfigRepository.java	90.00%	2 Missing and 1 partial ⚠️
...ctrip/framework/apollo/internals/SimpleConfig.java	85.00%	2 Missing and 1 partial ⚠️
... and 11 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #146      +/-   ##
============================================
+ Coverage     68.68%   71.54%   +2.86%     
- Complexity     1503     1671     +168     
============================================
  Files           212      225      +13     
  Lines          6396     6755     +359     
  Branches        647      680      +33     
============================================
+ Hits           4393     4833     +440     
+ Misses         1673     1572     -101     
- Partials        330      350      +20     

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