[07] feat(angular): model dependency injection and HTTP interceptors

[fernandofielmann]

Goal

Represent static Angular provider configuration and interceptor chains using explicit semantic relationships.

Scope

• Generalize existing inject(HttpClient) handling to literal provider declarations.
• Recognize providedIn, bootstrapApplication, providers, provideHttpClient, and withInterceptors.
• Model class, value, existing, and statically resolvable token providers conservatively.
• Emit PROVIDES and INTERCEPTS edges with token, multi, source, and declared order metadata.
• Defer dynamic factories, spread arrays, computed tokens, and ambiguous provider graphs.
• Keep provider/interceptor edges out of cross_service by default.

Dependencies

• Depends on: [04] feat(angular): model router navigation and lazy loading #11 ([04] Angular navigation/application semantic foundation) and merged Angular metadata PR feat(angular): model declaration metadata #5.
• Can be implemented in parallel with [06] feat(angular): model route guards #13 ([06] route guards).
• Blocks: [14] cross-stack feature flags.

Acceptance criteria

• Root, component, module, and providedIn providers are represented when static.
• Functional and class-based interceptors preserve declaration order.
• Multi-provider registrations coexist without accidental deduplication.
• Dynamic/ambiguous factories do not create false resolution edges.
• Sequential and parallel pipelines emit equivalent edges and properties.
• MCP schema, graph contracts, and README document the new relationships.

Validation

• Add positive, negative, factory, ambiguity, multi-provider, ordering, and parity tests.
• Run Angular extraction/edge probes, lint-ci, and scripts/test.sh.