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Feature: Allow extensions to customize Vert.x options and bootstrap at build time with priority ordering

Feature: Allow extensions to customize Vert.x options and bootstrap at build time with priority ordering: a task in LegoFlow-SWE (Harbor dataset). Problem Extensions like OpenTelemetry need to configure Vert.x 5 internals (e.g., setting a tracer factory or metrics) before the Vertx instance is…

The task

**Problem** Extensions like OpenTelemetry need to configure Vert.x 5 internals (e.g., setting a tracer factory or metrics) before the `Vertx` instance is created. Currently there is no hook to inject customizations at build time, so extensions must work around the missing infrastructure.

Part of Lego-X/LegoFlow-SWE.