refactor(rpc): Centralize RPC service and unify API (#1427)

This change introduces a major refactoring of the RPC service layer to improve modularity, unify the API, and simplify the overall architecture.

Key changes:
- Replaced per-network-instance RPC services with a single global RPC server, reducing resource usage and simplifying management.
- All clients (CLI, Web UI, etc.) now interact with EasyTier core through a unified RPC entrypoint, enabling consistent authentication and control.
- RPC implementation logic has been moved to `easytier/src/rpc_service/` and organized by functionality (e.g., `instance_manage.rs`, `peer_manage.rs`, `config.rs`) for better maintainability.
- Standardized Protobuf API definitions under `easytier/src/proto/` with an `api_` prefix (e.g., `cli.proto` → `api_instance.proto`) to provide a consistent interface.
- CLI commands now require explicit `--instance-id` or `--instance-name` when multiple network instances are running; the parameter is optional when only one instance exists.

BREAKING CHANGE:  
RPC portal configuration (`rpc_portal` and `rpc_portal_whitelist`) has been removed from per-instance configs and the Web UI. The RPC listen address must now be specified globally via the `--rpc-portal` command-line flag or the `ET_RPC_PORTAL` environment variable, as there is only one RPC service for the entire application.

easytier-web/frontend-lib/src/components/Config.vue

@@ -307,23 +307,6 @@ const portForwardProtocolOptions = ref(["tcp", "udp"]);
                 </div>
               </div>
 
-              <div class="flex flex-row gap-x-9 flex-wrap">
-                <div class="flex flex-col gap-2 basis-5/12 grow">
-                  <label for="rpc_port">{{ t('rpc_port') }}</label>
-                  <InputNumber id="rpc_port" v-model="curNetwork.rpc_port" aria-describedby="rpc_port-help"
-                    :format="false" :min="0" :max="65535" />
-                </div>
-              </div>
-
-              <div class="flex flex-row gap-x-9 flex-wrap w-full">
-                <div class="flex flex-col gap-2 grow p-fluid">
-                  <label for="">{{ t('rpc_portal_whitelists') }}</label>
-                  <AutoComplete id="rpc_portal_whitelists" v-model="curNetwork.rpc_portal_whitelists"
-                    :placeholder="t('chips_placeholder', ['127.0.0.0/8'])" class="w-full" multiple fluid
-                    :suggestions="inetSuggestions" @complete="searchInetSuggestions" />
-                </div>
-              </div>
-
               <div class="flex flex-row gap-x-9 flex-wrap">
                 <div class="flex flex-col gap-2 basis-5/12 grow">
                   <label for="dev_name">{{ t('dev_name') }}</label>

easytier-web/frontend-lib/src/types/network.ts

@@ -31,7 +31,6 @@ export interface NetworkConfig {
   advanced_settings: boolean
 
   listener_urls: string[]
-  rpc_port: number
   latency_first: boolean
 
   dev_name: string
@@ -70,8 +69,6 @@ export interface NetworkConfig {
   enable_magic_dns?: boolean
   enable_private_mode?: boolean
 
-  rpc_portal_whitelists: string[]
-
   port_forwards: PortForwardConfig[]
 }
 
@@ -104,7 +101,6 @@ export function DEFAULT_NETWORK_CONFIG(): NetworkConfig {
       'udp://0.0.0.0:11010',
       'wg://0.0.0.0:11011',
     ],
-    rpc_port: 0,
     latency_first: false,
     dev_name: '',
 
@@ -135,7 +131,6 @@ export function DEFAULT_NETWORK_CONFIG(): NetworkConfig {
     mapped_listeners: [],
     enable_magic_dns: false,
     enable_private_mode: false,
-    rpc_portal_whitelists: [],
     port_forwards: [],
   }
 }