feat: taxation settings UX, regime-aware tributos profile, IBGE fallback and municipality fixes

[vitormattos]

Summary

This PR consolidates multiple rounds of improvements to the NFS-e taxation settings and emission flow:

Taxation Settings Simplification

• Remove the tributacao_federal_mode radio group — percentage_profile mode is now fixed/enforced via hidden input
• Remove deprecated stored amount fields (base_calculo, valor_pis, valor_cofins) from validation and persistence; purge them from existing settings on save
• Relabel IRRF, CSLL, CP fields as percentage inputs with UI hints
• Rename piscofins_base_calculo string key to piscofins_preview_note (computed note, not user input)
• Add BrasilAPI as IBGE fallback for the municipalities endpoint; return graceful 200 with empty data instead of 502 when both sources fail
• Add BrasilAPI retry(2,150) on municipality queries

Regime-aware Tributos Profile

• Detect opcao_simples_nacional at emission time: use tributos_fed/est/mun_sn keys when the company is a Simples Nacional optant; use tributos_fed/est/mun_p keys otherwise
• Emit totalTributosPercentualFederal/Estadual/Municipal fields into DpsData (requires nfse-php companion PR)
• Guard company_id() call in resolveCompanyId() with try/catch to prevent broken test environment failures from Company::getCurrent()
• Show only the relevant tributos profile section (P or SN) based on the saved opcao_simples_nacional setting

Municipality UF → IBGE Reset (front-end fix)

• loadMunicipalities() now clears both ibgeHidden and ibgeDisplay before fetching so stale IBGE codes from the previous UF are never submitted

Tests & E2E

• SettingsControllerTest: add municipality fallback + graceful failure paths
• InvoiceControllerTest: cover regime-aware profile selection and XML element ordering
• OperationalViewsExistenceTest: extend view existence assertions
• nfse-settings.spec.ts: add E2E for municipality IBGE reset when UF changes
• nfse-emission.spec.ts: extend emission flow specs with tributos and XML field assertions

Package dependency

• The totalTributosPercentual fields in DpsData and the XmlBuilder element ordering fix are in companion PR: feat: fix XML element ordering and add totalTributosPercentual fields nfse-php#14