feat(logs): add Logs Dashboard with real-time Console Viewer

- Consolidated 4-tab Logs page: Request Logs, Proxy Logs, Audit Logs, Console
- Terminal-style Console Log Viewer with level filter, search, auto-scroll
- Console interceptor captures all console.log/warn/error to JSON log file
- Integrated in Next.js instrumentation.ts for both dev and prod
- Log rotation by size + retention-based cleanup
- Fixed pino logger file transport (pino/file targets only)
- Moved initAuditLog() to instrumentation.ts for proper initialization
- Bumped version to 1.0.3
- Updated CHANGELOG, all 8 README translations, and .env.example

src/shared/utils/structuredLogger.ts

@@ -5,10 +5,15 @@
  * and human-readable output for development. Replaces scattered console.log
  * calls with consistent, parseable log entries.
  *
+ * When LOG_TO_FILE is enabled, log entries are also appended as JSON lines
+ * to the application log file for the Console Log Viewer.
+ *
  * @module shared/utils/structuredLogger
  */
 
 import { getCorrelationId } from "../middleware/correlationId";
+import { appendFileSync, existsSync, mkdirSync } from "fs";
+import { dirname, resolve } from "path";
 
 const LOG_LEVELS: Record<string, number> = {
   debug: 10,
@@ -21,7 +26,40 @@ const LOG_LEVELS: Record<string, number> = {
 const currentLevel = LOG_LEVELS[process.env.LOG_LEVEL?.toLowerCase() || ""] || LOG_LEVELS.info;
 const isProduction = process.env.NODE_ENV === "production";
 
-function formatEntry(level: string, component: string, message: string, meta?: Record<string, unknown>) {
+// File logging configuration
+const logToFile = process.env.LOG_TO_FILE !== "false";
+const logFilePath = resolve(process.env.LOG_FILE_PATH || "logs/application/app.log");
+
+// Ensure log directory exists once at module load
+if (logToFile) {
+  try {
+    const dir = dirname(logFilePath);
+    if (!existsSync(dir)) {
+      mkdirSync(dir, { recursive: true });
+    }
+  } catch {
+    // silently ignore — will retry on each write
+  }
+}
+
+/**
+ * Append a JSON log line to the log file (non-blocking best-effort).
+ */
+function writeToFile(entry: Record<string, unknown>) {
+  if (!logToFile) return;
+  try {
+    appendFileSync(logFilePath, JSON.stringify(entry) + "\n");
+  } catch {
+    // Silently fail — file logging should never break the app
+  }
+}
+
+function formatEntry(
+  level: string,
+  component: string,
+  message: string,
+  meta?: Record<string, unknown>
+) {
   const entry: Record<string, unknown> = {
     timestamp: new Date().toISOString(),
     level,
@@ -46,30 +84,60 @@ function formatEntry(level: string, component: string, message: string, meta?: R
   return `[${entry.timestamp}] ${level.toUpperCase().padEnd(5)} [${component}]${corrStr} ${message}${metaStr}`;
 }
 
+function buildEntry(
+  level: string,
+  component: string,
+  message: string,
+  meta?: Record<string, unknown>
+) {
+  const entry: Record<string, unknown> = {
+    timestamp: new Date().toISOString(),
+    level,
+    component,
+    message,
+    ...meta,
+  };
+  const correlationId = getCorrelationId() as string | undefined;
+  if (correlationId) {
+    entry.correlationId = correlationId;
+  }
+  return entry;
+}
+
 export function createLogger(component: string) {
   return {
     debug(message: string, meta?: Record<string, unknown>) {
       if (currentLevel <= LOG_LEVELS.debug) {
+        const entry = buildEntry("debug", component, message, meta);
         console.debug(formatEntry("debug", component, message, meta));
+        writeToFile(entry);
       }
     },
     info(message: string, meta?: Record<string, unknown>) {
       if (currentLevel <= LOG_LEVELS.info) {
+        const entry = buildEntry("info", component, message, meta);
         console.info(formatEntry("info", component, message, meta));
+        writeToFile(entry);
       }
     },
     warn(message: string, meta?: Record<string, unknown>) {
       if (currentLevel <= LOG_LEVELS.warn) {
+        const entry = buildEntry("warn", component, message, meta);
         console.warn(formatEntry("warn", component, message, meta));
+        writeToFile(entry);
       }
     },
     error(message: string, meta?: Record<string, unknown>) {
       if (currentLevel <= LOG_LEVELS.error) {
+        const entry = buildEntry("error", component, message, meta);
         console.error(formatEntry("error", component, message, meta));
+        writeToFile(entry);
       }
     },
     fatal(message: string, meta?: Record<string, unknown>) {
+      const entry = buildEntry("fatal", component, message, meta);
       console.error(formatEntry("fatal", component, message, meta));
+      writeToFile(entry);
     },
     child(defaultMeta: Record<string, unknown>) {
       return createLogger(component);