Refactor environment variables with shorter names and add comprehensive override support

- Rename OVERRIDE_INTERFACE_* to WG_* (shorter, non-conflicting)
- Add interface overrides: WG_PORT, WG_DEVICE, WG_MTU, WG_IPV4_CIDR, WG_IPV6_CIDR, WG_ENABLED
- Add client config overrides: WG_HOST, WG_CLIENT_PORT, WG_DEFAULT_DNS, WG_DEFAULT_ALLOWED_IPS, WG_DEFAULT_MTU, WG_DEFAULT_PERSISTENT_KEEPALIVE
- Add general config overrides: WG_SESSION_TIMEOUT, WG_METRICS_PROMETHEUS, WG_METRICS_JSON
- Update all API endpoints to apply and filter overrides
- Update documentation with all new environment variables
- Exclude AmneziaWG parameters (j*, s*, i*, h*) as requested

Co-authored-by: kaaax0815 <32197462+kaaax0815@users.noreply.github.com>

src/server/api/admin/general.get.ts

@@ -1,4 +1,5 @@
 export default definePermissionEventHandler('admin', 'any', async () => {
   const generalConfig = await Database.general.getConfig();
-  return generalConfig;
+  const generalConfigWithOverrides = applyGeneralOverrides(generalConfig);
+  return generalConfigWithOverrides;
 });

src/server/api/admin/general.post.ts

@@ -8,7 +8,20 @@ export default definePermissionEventHandler(
       event,
       validateZod(GeneralUpdateSchema, event)
     );
-    await Database.general.update(data);
+
+    // Remove overridden fields from the update data
+    const updateData = { ...data };
+    if (WG_GENERAL_OVERRIDE_ENV.SESSION_TIMEOUT !== undefined) {
+      delete updateData.sessionTimeout;
+    }
+    if (WG_GENERAL_OVERRIDE_ENV.METRICS_PROMETHEUS !== undefined) {
+      delete updateData.metricsPrometheus;
+    }
+    if (WG_GENERAL_OVERRIDE_ENV.METRICS_JSON !== undefined) {
+      delete updateData.metricsJson;
+    }
+
+    await Database.general.update(updateData);
     return { success: true };
   }
 );

src/server/api/admin/interface/cidr.post.ts

@@ -9,7 +9,16 @@ export default definePermissionEventHandler(
       validateZod(InterfaceCidrUpdateSchema, event)
     );
 
-    await Database.interfaces.updateCidr(data);
+    // Remove overridden fields from the update data
+    const updateData = { ...data };
+    if (WG_OVERRIDE_ENV.IPV4_CIDR !== undefined) {
+      delete updateData.ipv4Cidr;
+    }
+    if (WG_OVERRIDE_ENV.IPV6_CIDR !== undefined) {
+      delete updateData.ipv6Cidr;
+    }
+
+    await Database.interfaces.updateCidr(updateData);
     await WireGuard.saveConfig();
     return { success: true };
   }

src/server/api/admin/interface/index.post.ts

@@ -11,15 +11,24 @@ export default definePermissionEventHandler(
 
     // Remove overridden fields from the update data
     const updateData = { ...data };
-    if (WG_OVERRIDE_ENV.INTERFACE_PORT !== undefined) {
+    if (WG_OVERRIDE_ENV.PORT !== undefined) {
       delete updateData.port;
     }
-    if (WG_OVERRIDE_ENV.INTERFACE_DEVICE !== undefined) {
+    if (WG_OVERRIDE_ENV.DEVICE !== undefined) {
       delete updateData.device;
     }
-    if (WG_OVERRIDE_ENV.INTERFACE_MTU !== undefined) {
+    if (WG_OVERRIDE_ENV.MTU !== undefined) {
       delete updateData.mtu;
     }
+    if (WG_OVERRIDE_ENV.IPV4_CIDR !== undefined) {
+      delete updateData.ipv4Cidr;
+    }
+    if (WG_OVERRIDE_ENV.IPV6_CIDR !== undefined) {
+      delete updateData.ipv6Cidr;
+    }
+    if (WG_OVERRIDE_ENV.ENABLED !== undefined) {
+      delete updateData.enabled;
+    }
 
     await Database.interfaces.update(updateData);
     await WireGuard.saveConfig();

src/server/api/admin/userconfig.get.ts

@@ -1,4 +1,5 @@
 export default definePermissionEventHandler('admin', 'any', async () => {
   const userConfig = await Database.userConfigs.get();
-  return userConfig;
+  const userConfigWithOverrides = applyUserConfigOverrides(userConfig);
+  return userConfigWithOverrides;
 });

src/server/api/admin/userconfig.post.ts

@@ -8,7 +8,29 @@ export default definePermissionEventHandler(
       event,
       validateZod(UserConfigUpdateSchema, event)
     );
-    await Database.userConfigs.update(data);
+
+    // Remove overridden fields from the update data
+    const updateData = { ...data };
+    if (WG_CLIENT_OVERRIDE_ENV.HOST !== undefined) {
+      delete updateData.host;
+    }
+    if (WG_CLIENT_OVERRIDE_ENV.CLIENT_PORT !== undefined) {
+      delete updateData.port;
+    }
+    if (WG_CLIENT_OVERRIDE_ENV.DEFAULT_DNS !== undefined) {
+      delete updateData.defaultDns;
+    }
+    if (WG_CLIENT_OVERRIDE_ENV.DEFAULT_ALLOWED_IPS !== undefined) {
+      delete updateData.defaultAllowedIps;
+    }
+    if (WG_CLIENT_OVERRIDE_ENV.DEFAULT_MTU !== undefined) {
+      delete updateData.defaultMtu;
+    }
+    if (WG_CLIENT_OVERRIDE_ENV.DEFAULT_PERSISTENT_KEEPALIVE !== undefined) {
+      delete updateData.defaultPersistentKeepalive;
+    }
+
+    await Database.userConfigs.update(updateData);
     await WireGuard.saveConfig();
     return { success: true };
   }