Refactor/simplify proxy logs (#585)

* refactor(proxy): simplify logging for better readability

- Delete 17 verbose debug logs from handlers, streaming, and response_processor
- Convert excessive INFO logs to DEBUG level for internal processing details
- Add 2 critical INFO logs in forwarder.rs for failover scenarios:
  - Log when switching to next provider after failure
  - Log when all providers have been exhausted
- Fix clippy uninlined_format_args warning

This reduces log noise while maintaining visibility into key user-facing decisions.

* fix: replace unsafe unwrap() calls with proper error handling

- database/dao/mcp.rs: Use map_err for serde_json serialization
- database/dao/providers.rs: Use map_err for settings_config and meta serialization
- commands/misc.rs: Use expect() for compile-time regex pattern
- services/prompt.rs: Use unwrap_or_default() for SystemTime
- deeplink/provider.rs: Replace unwrap() with is_none_or pattern for Option checks

Reduces potential panic points from 26 to 1 (static regex init, safe).

* refactor(proxy): simplify verbose logging output

- Remove response JSON full output logging in response_processor
- Remove per-request INFO logs in provider_router (failover status, provider selection)
- Change model mapping log from INFO to DEBUG
- Change usage logging failure from INFO to WARN
- Remove redundant debug logs for circuit breaker operations

Reduces log noise significantly while preserving important warnings and errors.

* feat(proxy): add structured log codes for i18n support

Add error code system to proxy module logs for multi-language support:

- CB-001~006: Circuit breaker state transitions and triggers
- SRV-001~004: Proxy server lifecycle events
- FWD-001~002: Request forwarding and failover
- FO-001~005: Failover switch operations
- USG-001~002: Usage logging errors

Log format: [CODE] Chinese message
Frontend/log tools can map codes to any language.

New file: src/proxy/log_codes.rs - centralized code definitions

* chore: bump version to 3.9.1

* style: format code with prettier and rustfmt

* fix(ui): allow number inputs to be fully cleared before saving

- Convert numeric state to string type for controlled inputs
- Use isNaN() check instead of || fallback to allow 0 values
- Apply fix to ProxyPanel, CircuitBreakerConfigPanel,
  AutoFailoverConfigPanel, and ModelTestConfigPanel

* feat(pricing): support @ separator in model name matching

- Refactor model name cleaning into chained method calls
- Add @ to - replacement (e.g., gpt-5.2-codex@low → gpt-5.2-codex-low)
- Add test case for @ separator matching

* fix(proxy): improve validation and error handling in proxy config panels

- Add StopTimeout/StopFailed error types for proper stop() error reporting
- Replace silent clamp with validation-and-block in config panels
- Add listenAddress format validation in ProxyPanel
- Use log_codes constants instead of hardcoded strings
- Use once_cell::Lazy for regex precompilation

* fix(proxy): harden error handling and input validation

- Handle RwLock poisoning in settings.rs with unwrap_or_else
- Add fallback for dirs::home_dir() in config modules
- Normalize localhost to 127.0.0.1 in ProxyPanel
- Format IPv6 addresses with brackets for valid URLs
- Strict port validation with pure digit regex
- Treat NaN as validation failure in config panels
- Log warning on cost_multiplier parse failure
- Align timeoutSeconds range to [0, 300] across all panels

src/components/proxy/ProxyPanel.tsx

@@ -38,15 +38,15 @@ export function ProxyPanel() {
   const { data: globalConfig } = useGlobalProxyConfig();
   const updateGlobalConfig = useUpdateGlobalProxyConfig();
 
-  // 监听地址/端口的本地状态
+  // 监听地址/端口的本地状态（端口用字符串以支持完全清空）
   const [listenAddress, setListenAddress] = useState("127.0.0.1");
-  const [listenPort, setListenPort] = useState(15721);
+  const [listenPort, setListenPort] = useState("15721");
 
   // 同步全局配置到本地状态
   useEffect(() => {
     if (globalConfig) {
       setListenAddress(globalConfig.listenAddress);
-      setListenPort(globalConfig.listenPort);
+      setListenPort(String(globalConfig.listenPort));
     }
   }, [globalConfig]);
 
@@ -102,12 +102,57 @@ export function ProxyPanel() {
 
   const handleSaveBasicConfig = async () => {
     if (!globalConfig) return;
+
+    // 校验地址格式（简单的 IP 地址或 localhost 校验）
+    const addressTrimmed = listenAddress.trim();
+    const ipv4Regex = /^(\d{1,3}\.){3}\d{1,3}$/;
+    // 规范化 localhost 为 127.0.0.1
+    const normalizedAddress =
+      addressTrimmed === "localhost" ? "127.0.0.1" : addressTrimmed;
+    const isValidAddress =
+      normalizedAddress === "0.0.0.0" ||
+      (ipv4Regex.test(normalizedAddress) &&
+        normalizedAddress.split(".").every((n) => {
+          const num = parseInt(n);
+          return num >= 0 && num <= 255;
+        }));
+    if (!isValidAddress) {
+      toast.error(
+        t("proxy.settings.invalidAddress", {
+          defaultValue:
+            "地址无效，请输入有效的 IP 地址（如 127.0.0.1）或 localhost",
+        }),
+      );
+      return;
+    }
+
+    // 严格校验端口：必须是纯数字
+    const portTrimmed = listenPort.trim();
+    if (!/^\d+$/.test(portTrimmed)) {
+      toast.error(
+        t("proxy.settings.invalidPort", {
+          defaultValue: "端口无效，请输入 1024-65535 之间的数字",
+        }),
+      );
+      return;
+    }
+    const port = parseInt(portTrimmed);
+    if (isNaN(port) || port < 1024 || port > 65535) {
+      toast.error(
+        t("proxy.settings.invalidPort", {
+          defaultValue: "端口无效，请输入 1024-65535 之间的数字",
+        }),
+      );
+      return;
+    }
     try {
       await updateGlobalConfig.mutateAsync({
         ...globalConfig,
-        listenAddress,
-        listenPort,
+        listenAddress: normalizedAddress,
+        listenPort: port,
       });
+      // 同步更新本地状态为规范化后的值
+      setListenAddress(normalizedAddress);
       toast.success(
         t("proxy.settings.configSaved", { defaultValue: "代理配置已保存" }),
         { closeButton: true },
@@ -133,6 +178,13 @@ export function ProxyPanel() {
     }
   };
 
+  // 格式化地址用于 URL（IPv6 需要方括号）
+  const formatAddressForUrl = (address: string, port: number): string => {
+    const isIPv6 = address.includes(":");
+    const host = isIPv6 ? `[${address}]` : address;
+    return `http://${host}:${port}`;
+  };
+
   return (
     <>
       <section className="space-y-6">
@@ -147,14 +199,14 @@ export function ProxyPanel() {
                 </p>
                 <div className="flex flex-col gap-2 sm:flex-row sm:items-center">
                   <code className="flex-1 text-sm bg-background px-3 py-2 rounded border border-border/60">
-                    http://{status.address}:{status.port}
+                    {formatAddressForUrl(status.address, status.port)}
                   </code>
                   <Button
                     size="sm"
                     variant="outline"
                     onClick={() => {
                       navigator.clipboard.writeText(
-                        `http://${status.address}:${status.port}`,
+                        formatAddressForUrl(status.address, status.port),
                       );
                       toast.success(
                         t("proxy.panel.addressCopied", {
@@ -389,9 +441,12 @@ export function ProxyPanel() {
                     id="listen-address"
                     value={listenAddress}
                     onChange={(e) => setListenAddress(e.target.value)}
-                    placeholder={t("proxy.settings.fields.listenAddress.placeholder", {
-                      defaultValue: "127.0.0.1",
-                    })}
+                    placeholder={t(
+                      "proxy.settings.fields.listenAddress.placeholder",
+                      {
+                        defaultValue: "127.0.0.1",
+                      },
+                    )}
                   />
                   <p className="text-xs text-muted-foreground">
                     {t("proxy.settings.fields.listenAddress.description", {
@@ -411,12 +466,13 @@ export function ProxyPanel() {
                     id="listen-port"
                     type="number"
                     value={listenPort}
-                    onChange={(e) =>
-                      setListenPort(parseInt(e.target.value) || 15721)
-                    }
-                    placeholder={t("proxy.settings.fields.listenPort.placeholder", {
-                      defaultValue: "15721",
-                    })}
+                    onChange={(e) => setListenPort(e.target.value)}
+                    placeholder={t(
+                      "proxy.settings.fields.listenPort.placeholder",
+                      {
+                        defaultValue: "15721",
+                      },
+                    )}
                   />
                   <p className="text-xs text-muted-foreground">
                     {t("proxy.settings.fields.listenPort.description", {