refactor(ui): refactor Tags API wrapper and store

[luizhf42]

This PR modernizes the tags module by migrating from Vuex-like patterns to Pinia composition API, simplifying the store interface and improving consistency with other modules in the codebase.

Changes

• Store refactoring

  • Migrated to Pinia composition API with ref-based state
  • Consolidated state: numberTags → tagCount, removed page, perPage, filter from state
  • Unified tag selection into single selectedTags array (removed device/container variants)
  • Removed computed getters - components access state directly
  • Simplified method signatures: removed tenant parameter objects to match the new API endpoints
  • Removed redundant methods: search, autocomplete (unified into fetchTagList), setSelected, clearSelected

• Components

  • Updated all components to use new store API
  • Refactored TagFormUpdate with dedicated addTag/removeTag methods
  • Improved validation logic in TagCreate and TagEdit
  • Updated TagSelector to use toggleSelectedTag and direct array manipulation

• API layer

  • Reordered getTags parameters for better ergonomics: getTags(page, perPage, filter?)
  • Added IUpdateTagName interface for type safety

• Tests

  • Updated all component tests to match new store API
  • Completely rewrote store unit tests with comprehensive coverage