Fix code review issues: unsafe casts, NPE risks, magic numbers, and typos

[Copilot]

• Fix unsafe cast in ConfigurableAutoConfigurationImportFilter.ExcludedAutoConfigurationClassPropertySource.get() — add instanceof check before cast to prevent ClassCastException
• Fix potential NPE in EventPublishingConfigurationPropertiesBeanPropertyChangedListener.initConfigurationPropertiesBeanContext() — add null check for target.getValue()
• Fix potential NPE in ConfigurationPropertiesBeanContext.convertForProperty() — add null checks for value and conversionService
• Fix unsafe (int) cast in MultipartConfigFactory.createMultipartConfig() — use Math.toIntExact() for safe conversion
• Fix magic number 2147483647 in ServerProperties — replace with Integer.MAX_VALUE
• Fix typo "Disalbed" → "Disabled" in test @DisplayName annotations

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rties/bind/ConfigurationPropertiesBeanContext.java	0.00%	1 Missing and 2 partials ⚠️
...gurationPropertiesBeanPropertyChangedListener.java	0.00%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...ure/ConfigurableAutoConfigurationImportFilter.java	100.00% <100.00%> (ø)	23.00 <0.00> (ø)
...gurationPropertiesBeanPropertyChangedListener.java	95.55% <0.00%> (-2.23%)	20.00 <0.00> (ø)
...rties/bind/ConfigurationPropertiesBeanContext.java	95.77% <0.00%> (-4.23%)	27.00 <2.00> (ø)

... and 1 file with indirect coverage changes

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