fix: support full null runtimes

[elpete]

Summary

ColdBox relied on missing struct keys evaluating like null in a number of lazy-initialization and optional-input paths. Full-null runtimes instead omit those keys, so direct access raised undefined-element errors while Quick's expanded full-null matrix initialized ColdBox and ran application requests.

This change makes those paths explicitly key-aware across framework lifecycle, LogBox, CacheBox, WireBox, rendering, routing, REST, async tasks, and testing helpers. It also makes HTTP Last-Modified comparison use the RFC 1123 GMT instant so Adobe and Lucee agree.

Supports coldbox-modules/quick#154 and coldbox-modules/quick#312.

Regression coverage

The regressions exercise public APIs rather than implementation details:

• Env.getJavaSystem() lazy initialization
• Util.getMixerUtil() lazy initialization
• LogBoxConfig.loadDataDSL() with a minimal public DSL
• CacheBoxConfig.loadDataDSL() with a minimal public DSL
• RequestContext.lastModified() HTTP-date behavior
• a dedicated Adobe 2025 full-null HTTP request that executes the same public APIs in a full-null application

Before the source fix, the Adobe endpoint failed with Element JAVASYSTEM is undefined. Additional full-suite failures exposed the other missing-key paths and were retained as fixes until the complete matrix was clean.

Validation

• Adobe 2025 full null: 1,329 passed, 0 failed, 0 errored, 7 skipped
• Lucee 6 full null: 1,304 passed, 0 failed, 0 errored, 2 skipped
• Lucee 6 normal null mode: 1,304 passed, 0 failed, 0 errored, 2 skipped
• cfformat checks passed for changed sources and regression fixtures
• git diff --check passed

Local ColdBox validation used the TestBox full-null corrections proposed in Ortus-Solutions/TestBox#200. The self-contained Adobe endpoint added here does not depend on that PR and is included directly in CI.

[github-actions]

Test Results

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 4b56616. ± Comparison against base commit 901ceef.

♻️ This comment has been updated with latest results.