feat(http): add pooled HTTP client with timeout budgets for third-par…

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…ty integrations

Introduces PooledHttpClientService (HttpClientModule) backed by keep-alive http/https agents (maxSockets=50) and three named timeout budgets:
short 3 s – health checks (Stellar Horizon, SendGrid)
medium 8 s – moderation API, webhook delivery
long 15 s – GitHub API (dependency freshness)

Registers the module globally in AppModule and migrates ExternalModerationApiService, WebhookChannel, ExternalHealthService, and DependencyFreshnessService off ad-hoc axios calls onto the shared client. Adds 12 unit tests covering budget timeouts, agent reuse, and teardown.

Closes #1153

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[RUKAYAT-CODER]

Great job so far

There are just two blockers — the workflow is failing and the merge conflict. Could you take a look and fix it so all checks pass?
You could pull from the main to get the changes before pushing.

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Updates pushed

Rebased onto latest main and fixed the integration test failures.

Root cause: @Global() only propagates when AppModule is the root context. Integration tests that bootstrap individual modules in isolation (e.g. UsersModule → EmailModule → JobsModule) never load AppModule, so PooledHttpClientService was unresolvable for DependencyFreshnessService.

Fix: Added HttpClientModule explicitly to the imports of each module that owns a service depending on PooledHttpClientService:

• JobsModule — DependencyFreshnessService
• HealthModule — ExternalHealthService
• ModerationModule — ExternalModerationApiService

Merge conflict: Upstream added FileUploadModule to app.module.ts in the same spot we added HttpClientModule. Resolved by keeping both, then rebased cleanly onto upstream/main.

[RUKAYAT-CODER]

You are almost there just update the Backend Module Changelog

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Changelog updated

Added [Unreleased] entries to all affected module changelogs:

• src/common/http-client/CHANGELOG.md (new) — documents PooledHttpClientService, HttpClientModule, and the three timeout budgets
• src/modules/jobs/CHANGELOG.md — DependencyFreshnessService migrated to long (15 s) budget
• src/modules/health/CHANGELOG.md — ExternalHealthService migrated to short (3 s) budget
• src/modules/moderation/CHANGELOG.md — ExternalModerationApiService migrated to medium (8 s) budget
• src/modules/notifications/CHANGELOG.md — WebhookChannel migrated to medium (8 s) budget (was previously unbounded)

[RUKAYAT-CODER]

Thank you for contributing to the project.