Add Micrometer custom counters for tracking searches by municipality/state

[Copilot]

Adds inline Micrometer counters at key access points to track usage patterns across epidemiological queries, risk assessments, triage evaluations, and hospital referrals — exposed via Spring Boot Actuator.

New metrics

Counter	Location	Tags
vigisus.buscas.municipio	PerfilEpidemiologicoService	coIbge, municipio, uf
vigisus.buscas.ranking	ConsultarRankingMunicipalUseCase	uf
vigisus.buscas.linguagem_natural	BuscaCompletaUseCase	query_tipo
vigisus.buscas.risco	ConsultarPrevisaoRiscoUseCase	coIbge, classificacao_risco
vigisus.triagens.avaliadas	AvaliarTriagemUseCase	prioridade
vigisus.encaminhamentos	ConsultarEncaminhamentoUseCase	tipo_leito

Changes

• MetricsConfig.java — new @Configuration placeholder in config/; counters are created inline via MeterRegistry injection
• PerfilEpidemiologicoService, ConsultarRankingMunicipalUseCase, BuscaCompletaUseCase, ConsultarPrevisaoRiscoUseCase, AvaliarTriagemUseCase, ConsultarEncaminhamentoUseCase — MeterRegistry injected via @RequiredArgsConstructor; counter incremented after successful response construction
• All affected unit tests updated to supply new SimpleMeterRegistry()

Example counter registration pattern used throughout:

meterRegistry.counter("vigisus.buscas.municipio",
    "coIbge", coIbge,
    "municipio", response.getMunicipio(),
    "uf", response.getUf()
).increment();

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