chore(config): increase default rate limit values

- Raise default RATE_LIMIT_READ_LIMIT from 500 to 1500
- Increase default RATE_LIMIT_WRITE_LIMIT from 50 to 150
- Update corresponding comments in .env.example file

Author: fulleni

.env.example

@@ -48,12 +48,12 @@
 # RATE_LIMIT_REQUEST_CODE_WINDOW_HOURS=24
 
 # OPTIONAL: Rate limit for general READ operations (e.g., GET /headlines).
-# RATE_LIMIT_READ_LIMIT=500
+# RATE_LIMIT_READ_LIMIT=1500
 # OPTIONAL: Window for READ operations, in minutes.
 # RATE_LIMIT_READ_WINDOW_MINUTES=60
 
 # OPTIONAL: Rate limit for general WRITE operations (e.g., POST /headlines).
 # This is typically stricter than the read limit.
-# RATE_LIMIT_WRITE_LIMIT=50
+# RATE_LIMIT_WRITE_LIMIT=150
 # OPTIONAL: Window for WRITE operations, in minutes.
 # RATE_LIMIT_WRITE_WINDOW_MINUTES=60

lib/src/config/environment_config.dart

@@ -159,9 +159,9 @@ abstract final class EnvironmentConfig {
 
   /// Retrieves the request limit for READ operations.
   ///
-  /// Defaults to 5000 if not set or if parsing fails.
+  /// Defaults to 1500 if not set or if parsing fails.
   static int get rateLimitReadLimit {
-    return int.tryParse(_env['RATE_LIMIT_READ_LIMIT'] ?? '500') ?? 500;
+    return int.tryParse(_env['RATE_LIMIT_READ_LIMIT'] ?? '1500') ?? 1500;
   }
 
   /// Retrieves the time window for the READ operations rate limit.
@@ -175,9 +175,9 @@ abstract final class EnvironmentConfig {
 
   /// Retrieves the request limit for WRITE operations.
   ///
-  /// Defaults to 500 if not set or if parsing fails.
+  /// Defaults to 150 if not set or if parsing fails.
   static int get rateLimitWriteLimit {
-    return int.tryParse(_env['RATE_LIMIT_WRITE_LIMIT'] ?? '50') ?? 50;
+    return int.tryParse(_env['RATE_LIMIT_WRITE_LIMIT'] ?? '150') ?? 150;
   }
 
   /// Retrieves the time window for the WRITE operations rate limit.