feat: add new interfaces, services, and utilities for API integration

refactor: reorganize type definitions and improve type safety

build: add lodash and @types/lodash as dependencies

chore: update tsconfig and vite config for path aliases

style: improve code organization and add documentation comments

fix: correct type usage in LanguageSwitcher component

perf: implement snackbar provider for global notifications

test: add new test interfaces and utility functions

ci: update pnpm-lock.yaml with new dependencies

pnpm-lock.yaml

@@ -35,6 +35,9 @@ importers:
       i18next-browser-languagedetector:
         specifier: ^8.2.0
         version: 8.2.0
+      lodash:
+        specifier: ^4.17.21
+        version: 4.17.21
       react:
         specifier: ^18.3.1
         version: 18.3.1
@@ -63,6 +66,9 @@ importers:
       '@eslint/js':
         specifier: ^9.36.0
         version: 9.37.0
+      '@types/lodash':
+        specifier: ^4.17.20
+        version: 4.17.20
       '@types/node':
         specifier: ^24.6.0
         version: 24.7.1
@@ -717,6 +723,9 @@ packages:
   '@types/json-schema@7.0.15':
     resolution: {integrity: sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==}
 
+  '@types/lodash@4.17.20':
+    resolution: {integrity: sha512-H3MHACvFUEiujabxhaI/ImO6gUrd8oOurg7LQtS7mbwIXA/cUqWrvBsaeJ23aZEPk1TAYkurjfMbSELfoCXlGA==}
+
   '@types/node@24.7.1':
     resolution: {integrity: sha512-CmyhGZanP88uuC5GpWU9q+fI61j2SkhO3UGMUdfYRE6Bcy0ccyzn1Rqj9YAB/ZY4kOXmNf0ocah5GtphmLMP6Q==}
 
@@ -2204,6 +2213,8 @@ snapshots:
 
   '@types/json-schema@7.0.15': {}
 
+  '@types/lodash@4.17.20': {}
+
   '@types/node@24.7.1':
     dependencies:
       undici-types: 7.14.0