fix(rate-limits): treat empty policies as unlimited

apps/web/src/pages/admin/RuntimePoliciesPanel.tsx

@@ -270,9 +270,9 @@ export function RuntimePoliciesPanel(props: {
         <section className="runtimePolicySection spanTwo">
           <header><strong>限流策略</strong><span>TPM / RPM / 并发</span></header>
           <div className="runtimePolicyRows">
-            <Label>RPM / 分钟请求<Input value={form.rpm} inputMode="numeric" onChange={(event) => setForm({ ...form, rpm: event.target.value })} /></Label>
-            <Label>TPM / 分钟 Token<Input value={form.tpm} inputMode="numeric" onChange={(event) => setForm({ ...form, tpm: event.target.value })} /></Label>
-            <Label>并发请求<Input value={form.concurrency} inputMode="numeric" onChange={(event) => setForm({ ...form, concurrency: event.target.value })} /></Label>
+            <Label>RPM / 分钟请求<Input value={form.rpm} placeholder="不填或负数为不限" inputMode="numeric" onChange={(event) => setForm({ ...form, rpm: event.target.value })} /></Label>
+            <Label>TPM / 分钟 Token<Input value={form.tpm} placeholder="不填或负数为不限" inputMode="numeric" onChange={(event) => setForm({ ...form, tpm: event.target.value })} /></Label>
+            <Label>并发请求<Input value={form.concurrency} placeholder="不填或负数为不限" inputMode="numeric" onChange={(event) => setForm({ ...form, concurrency: event.target.value })} /></Label>
           </div>
         </section>
 
@@ -760,9 +760,9 @@ function policyToForm(policy: RuntimePolicySet): RuntimePolicyForm {
     policyKey: policy.policyKey,
     name: policy.name,
     description: policy.description ?? '',
-    rpm: String(readRateLimit(rateRules, 'rpm') || ''),
-    tpm: String(readRateLimit(rateRules, 'tpm_total') || ''),
-    concurrency: String(readRateLimit(rateRules, 'concurrent') || ''),
+    rpm: formRateLimitText(readRateLimit(rateRules, 'rpm')),
+    tpm: formRateLimitText(readRateLimit(rateRules, 'tpm_total')),
+    concurrency: formRateLimitText(readRateLimit(rateRules, 'concurrent')),
     retryEnabled: readBool(retry.enabled, true),
     retryMaxAttempts: String(readNumber(retry.maxAttempts, 2)),
     retryAllowKeywords: tagsFromValue(retry.allowKeywords),
@@ -825,9 +825,9 @@ function isDefaultPolicy(policy: RuntimePolicySet) {
 
 function rateLimitSummary(policy: RuntimePolicySet) {
   const rules = Array.isArray(policy.rateLimitPolicy?.rules) ? policy.rateLimitPolicy.rules : [];
-  const rpm = readRateLimit(rules, 'rpm') || '-';
-  const tpm = readRateLimit(rules, 'tpm_total') || '-';
-  const concurrent = readRateLimit(rules, 'concurrent') || '-';
+  const rpm = rateLimitText(readRateLimit(rules, 'rpm'));
+  const tpm = rateLimitText(readRateLimit(rules, 'tpm_total'));
+  const concurrent = rateLimitText(readRateLimit(rules, 'concurrent'));
   return `RPM ${rpm} / TPM ${tpm} / 并发 ${concurrent}`;
 }
 
@@ -848,7 +848,16 @@ function degradeSummary(policy: RuntimePolicySet) {
 
 function readRateLimit(rules: unknown[], metric: string) {
   const rule = rules.find((item) => readObject(item).metric === metric);
-  return readNumber(readObject(rule).limit, 0);
+  const limit = Number(readObject(rule).limit);
+  return Number.isFinite(limit) ? limit : undefined;
+}
+
+function formRateLimitText(value: number | undefined) {
+  return value === undefined ? '' : String(value);
+}
+
+function rateLimitText(value: number | undefined) {
+  return value !== undefined && value > 0 ? String(value) : '不限';
 }
 
 function stringifyKeywords(value: unknown) {