refactor: centralize Firebase logging in HTTP interceptor

[rileychh]

Summary

Instead of sprinkling _firebase.log() calls in individual services, log all HTTP calls automatically via LogInterceptor.

• LogInterceptor now logs to both dart:developer and Crashlytics — every HTTP request/response becomes a breadcrumb automatically
• FirebaseService is now a top-level const instead of a Riverpod provider (it's stateless — just a facade over static Firebase singletons)
• PortalService no longer takes FirebaseService as a constructor dependency
• Body length uses type-safe switch expressions instead of dynamic .length dispatch, fixing potential NoSuchMethodError for FormData/Stream bodies

Trade-offs

• We lose semantic breadcrumbs like "Login successful" — Crashlytics will show POST https://app.ntut.edu.tw/login.do => 200 text/html 1KB instead
• We gain automatic coverage of every HTTP call without any per-service wiring
• New services get Crashlytics breadcrumbs for free without any setup

Test plan

• dart analyze passes
• Integration tests pass (pre-existing data-dependent failures unrelated to this change)

[rileychh-dokploy-riley-ntut-npc]

Dokploy Preview Deployment

Name	Status	Preview	Updated (UTC)
API Docs	✅ Done	Preview URL	2026-03-04T18:25:30.712Z

[github-actions]

PR Preview Builds

Build Number: 514
Commit: ec80a43
Message: fix: use type-safe body length in HTTP log interceptor

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[Copilot]

Pull request overview

This PR centralizes Firebase Crashlytics breadcrumb logging for network traffic by emitting HTTP request/response logs from the shared Dio LogInterceptor, and removes FirebaseService as an injected dependency from services in favor of a global firebase facade.

Changes:

• Log all HTTP responses to both dart:developer and Firebase Crashlytics via LogInterceptor.
• Replace the Riverpod firebaseServiceProvider with a global const firebase instance.
• Simplify PortalService construction and update affected integration tests and router creation accordingly.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/services/student_query_service_test.dart	Updates PortalService construction after removing FirebaseService injection.
test/services/portal_service_test.dart	Updates PortalService construction after removing FirebaseService injection.
test/services/i_school_plus_service_test.dart	Updates PortalService construction after removing FirebaseService injection.
test/services/course_service_test.dart	Updates PortalService construction after removing FirebaseService injection.
lib/utils/http.dart	Adds Crashlytics breadcrumb logging for HTTP responses via firebase.log().
lib/services/portal_service.dart	Removes FirebaseService dependency and per-method Firebase logging.
lib/services/firebase_service.dart	Removes Riverpod provider and introduces global const firebase facade.
lib/router/app_router.dart	Updates router factory to use global firebase.analyticsObserver instead of injected FirebaseService.
lib/main.dart	Stops reading FirebaseService from Riverpod; uses global firebase and updates router creation call.

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[bradly0cjw]

PR Summary

This PR refactors the network logging architecture by centralizing Firebase Crashlytics breadcrumbs into a single HTTP interceptor and streamlining the dependency injection graph.

Key Changes & Fixes:

• Centralized HTTP Logging: Moved _firebase.log() calls from individual services (like PortalService) into a shared Dio LogInterceptor. Every HTTP request and response is now automatically logged to both dart:developer and Firebase Crashlytics.
• Type-Safe Body Length Calculation: Fixed a potential runtime crash (NoSuchMethodError) when logging HTTP requests by replacing dynamic .length calls with a type-safe switch expression, which now safely handles FormData and Stream bodies.
• Simplified Dependency Injection: Removed FirebaseService from Riverpod providers. Since it acts as a stateless facade over static Firebase singletons, it's now defined as a top-level const firebase instance.
• Constructor Cleanup: Stripped the FirebaseService dependency from PortalService and other service constructors, significantly reducing boilerplate.

Architectural Impact:
This eliminates the "shotgun surgery" code smell—new services will now get Crashlytics breadcrumbs for free without any manual wiring. It also cleans up the DI container by removing unnecessary wrapper providers and eliminates a potential point of failure with dynamic type dispatching.