Refactor App Bootstrapping & DI Ownership Model

[armanist]

Summary

Complete refactoring of the Quantum PHP Framework application bootstrapping, dependency injection, and service ownership model. This introduces explicit application lifecycle boundaries, an instance-based DI container, and eliminates all static singleton patterns from core services.

Key changes

• AppContext as the central execution state holder per application run
• DiContainer instance-based container with strict Di::get() contract (must register before resolving)
• BootPipeline with ordered boot stages replacing implicit trait-based boot logic
• Request/Response converted from static facades to instance-based classes
• All 12 factories migrated from static instance caches to DI-managed lifetimes
• All service singletons (Cookie, Config, Environment, Server, Database, etc.) migrated to DI ownership
• Environment uses createArrayBacked() for isolated env loading, with environment() helper and shorthand methods

Guiding principle

Application execution defines scope. DI defines lifetime. Factories define construction.

Closes

Closes #373
Closes #374
Closes #375
Closes #376
Closes #377
Closes #378
Closes #379
Closes #380
Closes #381
Closes #382
Closes #452
Closes #454
Closes #455
Closes #456

[armanist]

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[armanist]

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[armanist]

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✅ Actions performed

Review triggered.

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