refactor: migrate to winston and enable daily rotated app logs (#71)

src/lib/antigravity/ClaudeRequestMapper.ts

@@ -2,6 +2,7 @@ import { v4 as uuidv4 } from 'uuid';
 import { mapClaudeModelToGemini } from './ModelMapping';
 import { cleanJsonSchema } from './JsonSchemaUtils';
 import { SignatureStore } from './SignatureStore';
+import { logger } from '../../utils/logger';
 import {
   ClaudeRequest,
   Message,
@@ -378,7 +379,7 @@ function injectGoogleSearchTool(body: { tools?: GeminiToolDeclaration[] }) {
 
   const hasFunctions = toolsArr.some((t) => t.functionDeclarations);
   if (hasFunctions) {
-    console.info('Skipping googleSearch injection due to existing functionDeclarations');
+    logger.info('Skipping googleSearch injection due to existing functionDeclarations');
     return;
   }
 

src/lib/antigravity/ClaudeStreamingMapper.ts

@@ -1,6 +1,7 @@
 import { GeminiPart, Usage, UsageMetadata } from './types';
 import { SignatureStore } from './SignatureStore';
 import { decodeSignature } from './signature-utils';
+import { logger } from '../../utils/logger';
 
 type BlockType = 'None' | 'Text' | 'Thinking' | 'Function';
 
@@ -249,7 +250,7 @@ export class StreamingState {
     const chunks: string[] = [];
     this.parseErrorCount++;
 
-    console.warn(
+    logger.warn(
       `[SSE-Parser] Parse error #${this.parseErrorCount}. Raw data length: ${rawData.length}`,
     );
 
@@ -260,7 +261,7 @@ export class StreamingState {
 
     // Emit error event if too many errors
     if (this.parseErrorCount > 3) {
-      console.error(
+      logger.error(
         `[SSE-Parser] High error rate (${this.parseErrorCount} errors). Stream may be corrupted.`,
       );
       chunks.push(

src/lib/antigravity/ModelMapping.ts

@@ -1,7 +1,4 @@
-const logger = {
-  log: (msg: string) => console.log(msg),
-  warn: (msg: string) => console.warn(msg),
-};
+import { logger } from '../../utils/logger';
 
 const CLAUDE_TO_GEMINI: Record<string, string> = {
   // Directly supported models
@@ -78,7 +75,7 @@ export function resolveModelRoute(
 ): string {
   // 1. Check custom exact mapping (Highest priority)
   if (customMapping[originalModel]) {
-    logger.log(
+    logger.info(
       `[Router] Using custom exact mapping: ${originalModel} -> ${customMapping[originalModel]}`,
     );
     return customMapping[originalModel];
@@ -98,7 +95,7 @@ export function resolveModelRoute(
     lowerModel === 'gpt-4'
   ) {
     if (openaiMapping['gpt-4-series']) {
-      logger.log(
+      logger.info(
         `[Router] Using GPT-4 series mapping: ${originalModel} -> ${openaiMapping['gpt-4-series']}`,
       );
       return openaiMapping['gpt-4-series'];
@@ -113,7 +110,7 @@ export function resolveModelRoute(
     lowerModel.includes('turbo')
   ) {
     if (openaiMapping['gpt-4o-series']) {
-      logger.log(
+      logger.info(
         `[Router] Using GPT-4o/3.5 series mapping: ${originalModel} -> ${openaiMapping['gpt-4o-series']}`,
       );
       return openaiMapping['gpt-4o-series'];
@@ -124,13 +121,13 @@ export function resolveModelRoute(
   if (lowerModel.startsWith('gpt-5')) {
     // Prefer gpt-5-series mapping, fallback to gpt-4-series if missing
     if (openaiMapping['gpt-5-series']) {
-      logger.log(
+      logger.info(
         `[Router] Using GPT-5 series mapping: ${originalModel} -> ${openaiMapping['gpt-5-series']}`,
       );
       return openaiMapping['gpt-5-series'];
     }
     if (openaiMapping['gpt-4-series']) {
-      logger.log(
+      logger.info(
         `[Router] Using GPT-4 series mapping (GPT-5 fallback): ${originalModel} -> ${openaiMapping['gpt-4-series']}`,
       );
       return openaiMapping['gpt-4-series'];

src/lib/antigravity/QuotaService.ts

@@ -1,5 +1,6 @@
 import axios, { AxiosError, AxiosInstance } from 'axios';
 import { QuotaData, Tier, LoadProjectResponse, QuotaApiResponse } from './types';
+import { logger } from '../../utils/logger';
 
 // Constants
 const QUOTA_API_URL = 'https://cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels';
@@ -48,15 +49,15 @@ export class QuotaService {
         const subscriptionTier = data.paidTier?.id || data.currentTier?.id;
 
         if (subscriptionTier) {
-          console.log(`📊 [${email}] Subscription Identified: ${subscriptionTier}`);
+          logger.info(`📊 [${email}] Subscription Identified: ${subscriptionTier}`);
         }
 
         return [projectId, subscriptionTier];
       } else {
-        console.warn(`⚠️  [${email}] loadCodeAssist failed: Status: ${res.status}`);
+        logger.warn(`⚠️  [${email}] loadCodeAssist failed: Status: ${res.status}`);
       }
     } catch (error: any) {
-      console.error(`❌ [${email}] loadCodeAssist Network Error: ${error.message}`);
+      logger.error(`❌ [${email}] loadCodeAssist Network Error: ${error.message}`);
     }
 
     return [undefined, undefined];
@@ -86,7 +87,7 @@ export class QuotaService {
     const url = QUOTA_API_URL;
     const maxRetries = 3;
 
-    console.log(`Sending quota request to ${url}`);
+    logger.info(`Sending quota request to ${url}`);
 
     for (let attempt = 1; attempt <= maxRetries; attempt++) {
       try {
@@ -104,11 +105,11 @@ export class QuotaService {
           subscriptionTier: subscriptionTier,
         };
 
-        console.log(`Quota API returned ${Object.keys(quotaResponse.models || {}).length} models:`);
+        logger.info(`Quota API returned ${Object.keys(quotaResponse.models || {}).length} models:`);
 
         if (quotaResponse.models) {
           for (const [name, info] of Object.entries(quotaResponse.models)) {
-            console.log(`   - ${name}`);
+            logger.info(`   - ${name}`);
             if (info.quotaInfo) {
               const fraction = info.quotaInfo.remainingFraction ?? 0;
               const percentage = Math.floor(fraction * 100);
@@ -135,7 +136,7 @@ export class QuotaService {
 
           // ✅ Handle 403 Forbidden specifically - return immediately, do not retry
           if (status === 403) {
-            console.warn(`Account no permission (403 Forbidden), marked as forbidden`);
+            logger.warn(`Account no permission (403 Forbidden), marked as forbidden`);
             return {
               quotaData: {
                 models: {},
@@ -146,9 +147,9 @@ export class QuotaService {
             };
           }
 
-          console.warn(`API Error: ${status} - ${text} (Attempt ${attempt}/${maxRetries})`);
+          logger.warn(`API Error: ${status} - ${text} (Attempt ${attempt}/${maxRetries})`);
         } else {
-          console.warn(`Request Failed: ${error.message} (Attempt ${attempt}/${maxRetries})`);
+          logger.warn(`Request Failed: ${error.message} (Attempt ${attempt}/${maxRetries})`);
         }
 
         if (attempt < maxRetries) {

src/lib/antigravity/SignatureStore.ts

@@ -2,6 +2,7 @@
  * Global thought_signature storage shared by all endpoints
  * Used to capture and replay signatures for Gemini 3+ function calls when clients don't pass them back.
  */
+import { logger } from '../../utils/logger';
 
 class SignatureStoreImpl {
   private static instance: SignatureStoreImpl;
@@ -28,12 +29,12 @@ class SignatureStoreImpl {
     const newLen = sig.length;
 
     if (newLen > existingLen) {
-      console.log(
+      logger.info(
         `[ThoughtSig] Storing new signature (length: ${newLen}, replacing old: ${existingLen})`,
       );
       this.signature = sig;
     } else {
-      console.debug(
+      logger.debug(
         `[ThoughtSig] Skipping shorter signature (new length: ${newLen}, existing: ${existingLen})`,
       );
     }

src/lib/antigravity/thinking-utils.ts

@@ -5,6 +5,7 @@
  * Problem: Invalid signatures cause thinking blocks to be dropped, losing content
  * Solution: Validate and convert invalid blocks to text instead of dropping
  */
+import { logger } from '../../utils/logger';
 
 /** Minimum length for a valid thought signature */
 const MIN_SIGNATURE_LENGTH = 10;
@@ -82,7 +83,7 @@ export function gracefulDegradeThinking(block: ContentBlock): ContentBlock | nul
   // Invalid signature - check if we have content to preserve
   if (thinkingBlock.thinking && thinkingBlock.thinking.length > 0) {
     // Convert to text block to preserve content
-    console.info(
+    logger.info(
       `[Thinking-Utils] Converting invalid thinking block to text. Content length: ${thinkingBlock.thinking.length}`,
     );
     return {
@@ -92,7 +93,7 @@ export function gracefulDegradeThinking(block: ContentBlock): ContentBlock | nul
   }
 
   // Empty content + invalid signature = drop
-  console.debug('[Thinking-Utils] Dropping empty thinking block with invalid signature');
+  logger.debug('[Thinking-Utils] Dropping empty thinking block with invalid signature');
   return null;
 }