test: add 22 integration tests for critical flows (#83)

[MarcosBrendonDePaula]

Summary

• Added 22 integration tests across 6 new test files covering the most critical framework flows
• Integration test coverage increased from ~11% (68/597) to ~14% (90/619)
• All 619 tests pass (0 failures)

New test files

File	Tests	Category
tests/integration/framework/request-lifecycle.test.ts	5	Request → plugin hooks → handler → response
tests/integration/framework/plugin-lifecycle.test.ts	4	Discovery → register → setup → hooks
tests/integration/live/live-components.test.ts	4	Connect → state sync → room → disconnect
tests/integration/auth/auth-flow.test.ts	3	Register → login → session → protected route
tests/integration/build/build-system.test.ts	3	Generator discovery, template engine
tests/integration/config/config-system.test.ts	3	Config modules, validation, framework context

What's tested

• Request lifecycle: Hook execution order (onRequest → onBeforeRoute → onAfterRoute → onBeforeResponse → onResponse), response modification via hooks, error hook catching, multi-plugin priority ordering, context shape
• Plugin lifecycle: Lifecycle hook order (setup → onBeforeServerStart → onServerStart → onAfterServerStart), dependency resolution across start(), Elysia route mounting from plugins, plugin context utilities (logger, config, utils)
• Live Components: Component mount + initial state, action-driven STATE_DELTA emissions, cross-component room event broadcasting, destroy cleanup
• Auth flow: Full register + login flow, session-based protected route access, unauthenticated 401 rejection
• Build system: FluxPluginsGenerator discovery, LiveComponentsGenerator component scanning, TemplateEngine variable substitution (kebab, pascal, camel, snake, constant)
• Config system: All config module exports validated, defineConfig with custom validators, FluxStackFramework context config loading

Closes #83

Test plan

• All 619 tests pass (597 existing + 22 new)
• No skipped tests in new files
• Tests follow existing patterns (app.handle, DI context, mock WebSocket)

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