feat: replace hardcoded usage limits with dynamic env variables (#180)

- About pages now read DAILY_REQUEST_LIMIT, DAILY_TOKEN_LIMIT, TPM_LIMIT from env
- Removed unused /app/api/config/ route
- Numbers formatted as Xk (e.g., 30k, 10k)

app/about/cn/page.tsx

@@ -10,7 +10,18 @@ export const metadata: Metadata = {
     keywords: ["AI图表", "draw.io", "AWS架构", "GCP图表", "Azure图表", "LLM"],
 }
 
+function formatNumber(num: number): string {
+    if (num >= 1000) {
+        return `${num / 1000}k`
+    }
+    return num.toString()
+}
+
 export default function AboutCN() {
+    const dailyRequestLimit = Number(process.env.DAILY_REQUEST_LIMIT) || 20
+    const dailyTokenLimit = Number(process.env.DAILY_TOKEN_LIMIT) || 500000
+    const tpmLimit = Number(process.env.TPM_LIMIT) || 50000
+
     return (
         <div className="min-h-screen bg-gray-50">
             {/* Navigation */}
@@ -122,13 +133,13 @@ export default function AboutCN() {
                                         Token 用量
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        5万
+                                        {formatNumber(tpmLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /分钟
                                         </span>
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        50万
+                                        {formatNumber(dailyTokenLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /天
                                         </span>
@@ -139,7 +150,7 @@ export default function AboutCN() {
                                         每日请求数
                                     </div>
                                     <div className="text-2xl font-bold text-gray-900">
-                                        20
+                                        {dailyRequestLimit}
                                     </div>
                                     <div className="text-sm text-gray-600">
                                         次

app/about/ja/page.tsx

@@ -17,7 +17,18 @@ export const metadata: Metadata = {
     ],
 }
 
+function formatNumber(num: number): string {
+    if (num >= 1000) {
+        return `${num / 1000}k`
+    }
+    return num.toString()
+}
+
 export default function AboutJA() {
+    const dailyRequestLimit = Number(process.env.DAILY_REQUEST_LIMIT) || 20
+    const dailyTokenLimit = Number(process.env.DAILY_TOKEN_LIMIT) || 500000
+    const tpmLimit = Number(process.env.TPM_LIMIT) || 50000
+
     return (
         <div className="min-h-screen bg-gray-50">
             {/* Navigation */}
@@ -130,13 +141,13 @@ export default function AboutJA() {
                                         トークン使用量
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        5万
+                                        {formatNumber(tpmLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /分
                                         </span>
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        50万
+                                        {formatNumber(dailyTokenLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /日
                                         </span>
@@ -147,7 +158,7 @@ export default function AboutJA() {
                                         1日のリクエスト数
                                     </div>
                                     <div className="text-2xl font-bold text-gray-900">
-                                        20
+                                        {dailyRequestLimit}
                                     </div>
                                     <div className="text-sm text-gray-600">
                                         回

app/about/page.tsx

@@ -17,7 +17,18 @@ export const metadata: Metadata = {
     ],
 }
 
+function formatNumber(num: number): string {
+    if (num >= 1000) {
+        return `${num / 1000}k`
+    }
+    return num.toString()
+}
+
 export default function About() {
+    const dailyRequestLimit = Number(process.env.DAILY_REQUEST_LIMIT) || 20
+    const dailyTokenLimit = Number(process.env.DAILY_TOKEN_LIMIT) || 500000
+    const tpmLimit = Number(process.env.TPM_LIMIT) || 50000
+
     return (
         <div className="min-h-screen bg-gray-50">
             {/* Navigation */}
@@ -136,13 +147,13 @@ export default function About() {
                                         Token Usage
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        50k
+                                        {formatNumber(tpmLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /min
                                         </span>
                                     </div>
                                     <div className="text-lg font-bold text-gray-900">
-                                        500k
+                                        {formatNumber(dailyTokenLimit)}
                                         <span className="text-sm font-normal text-gray-600">
                                             /day
                                         </span>
@@ -153,7 +164,7 @@ export default function About() {
                                         Daily Requests
                                     </div>
                                     <div className="text-2xl font-bold text-gray-900">
-                                        20
+                                        {dailyRequestLimit}
                                     </div>
                                     <div className="text-sm text-gray-600">
                                         requests

app/api/config/route.ts

@@ -1,15 +0,0 @@
-import { NextResponse } from "next/server"
-
-export async function GET() {
-    const accessCodes =
-        process.env.ACCESS_CODE_LIST?.split(",")
-            .map((code) => code.trim())
-            .filter(Boolean) || []
-
-    return NextResponse.json({
-        accessCodeRequired: accessCodes.length > 0,
-        dailyRequestLimit: parseInt(process.env.DAILY_REQUEST_LIMIT || "0", 10),
-        dailyTokenLimit: parseInt(process.env.DAILY_TOKEN_LIMIT || "0", 10),
-        tpmLimit: parseInt(process.env.TPM_LIMIT || "0", 10),
-    })
-}