fix: centralize app API URL fallbacks

src/vite-env.d.ts

@@ -41,6 +41,33 @@ interface ImportMetaEnv {
 
     // Search URL
     readonly VITE_SEARCH_URL: string
+
+    // TLSync
+    readonly VITE_TLSYNC_URL: string
+    readonly VITE_TLSYNC_SECRET: string
+
+    // WhisperLive
+    readonly VITE_WHISPERLIVE_URL: string
+
+    // LLM / Ollama
+    readonly VITE_LLM_PROVIDER: string
+    readonly VITE_OLLAMA_API_URL: string
+    readonly VITE_OLLAMA_BASE_URL: string
+
+    // API URL (legacy alias for VITE_API_BASE)
+    readonly VITE_API_URL: string
+
+    // Dev mode flag
+    readonly VITE_DEV: string
+
+    // Ports
+    readonly VITE_PORT_FRONTEND: string
+    readonly VITE_PORT_FRONTEND_HMR: string
+
+    // Neo4j
+    readonly VITE_NEO4J_URL: string
+    readonly VITE_NEO4J_USER: string
+    readonly VITE_NEO4J_PASSWORD: string
 }
 
 interface ImportMeta {