feat: add serverUrl configuration support with settings.json fallback

Implement serverUrl initialization following the cliApiToken design pattern:
- Environment variable HAPI_SERVER_URL (highest priority, allows temporary override)
- settings.json serverUrl field (user persistent configuration)
- Default value 'http://localhost:3006' (fallback)

Changes:
- Add serverUrl field to Settings interface (persistence.ts)
- Convert serverUrl to private property with getter/setter (configuration.ts)
- Create initializeServerUrl module to load from settings (serverUrlInit.ts)
- Integrate serverUrl initialization in tokenInit flow (tokenInit.ts)
- Skip auto-start when serverUrl is configured in settings (autoStartServer.ts)

cli/src/ui/serverUrlInit.ts

@@ -0,0 +1,31 @@
+/**
+ * Server URL initialization module
+ *
+ * Handles HAPI_SERVER_URL initialization with priority:
+ * 1. Environment variable (highest - allows temporary override)
+ * 2. Settings file (~/.hapi/settings.json)
+ * 3. Default value (http://localhost:3006)
+ */
+
+import { configuration } from '@/configuration'
+import { readSettings } from '@/persistence'
+
+/**
+ * Initialize server URL
+ * Must be called before any API operations
+ */
+export async function initializeServerUrl(): Promise<void> {
+    // 1. Environment variable has highest priority (allows temporary override)
+    if (process.env.HAPI_SERVER_URL) {
+        return
+    }
+
+    // 2. Read from settings file
+    const settings = await readSettings()
+    if (settings.serverUrl) {
+        configuration._setServerUrl(settings.serverUrl)
+        return
+    }
+
+    // 3. Default value already set in configuration constructor
+}

cli/src/ui/tokenInit.ts

@@ -12,12 +12,16 @@ import { stdin as input, stdout as output } from 'node:process'
 import chalk from 'chalk'
 import { configuration } from '@/configuration'
 import { readSettings, updateSettings } from '@/persistence'
+import { initializeServerUrl } from '@/ui/serverUrlInit'
 
 /**
  * Initialize CLI API token
  * Must be called before any API operations
  */
 export async function initializeToken(): Promise<void> {
+    // Initialize server URL first (env > settings.json > default)
+    await initializeServerUrl()
+
     // 1. Environment variable has highest priority (allows temporary override)
     if (configuration.cliApiToken) {
         return