fix: restore version 2 format and correct golangci-lint configuration

- Add required 'version: 2' field as requested in review
- Move goimports and gofmt from linters to formatters section
- Fix configuration structure to match golangci-lint v2 format
- Maintain all original and new linters from previous enhancement

Addresses feedback from maintainer review in #367

Signed-off-by: Rishi Jat <rishijat098@gmail.com>

Author: rishi-jat

.golangci.yml

@@ -1,10 +1,17 @@
+version: "2"
+
 # Enhanced golangci-lint configuration for llm-d-inference-scheduler
 # Expanded from 22 to 30+ linters for improved code quality, security, and maintainability
 # Focus on practical improvements suitable for Kubernetes controller development
 
 run:
   timeout: 10m
-  modules-download-mode: readonly
+  allow-parallel-runners: true
+
+formatters:
+  enable:
+    - goimports
+    - gofmt
 
 linters:
   enable:
@@ -31,10 +38,6 @@ linters:
     - unused            # Unused code (helps reduce bloat)
 
     # === NEW HIGH-VALUE ADDITIONS ===
-    # Formatting and style consistency
-    - gofmt             # Ensures code is gofmt-ed
-    - goimports         # Import organization and unused import removal
-    
     # Security enhancements
     - gosec             # Security vulnerability scanner
     - bodyclose         # Ensures HTTP response bodies are closed
@@ -70,7 +73,6 @@ linters:
     - gocognit          # Cognitive complexity (can be overly strict)
 
 issues:
-  # Exclude certain linters from running on files until build dependencies are resolved
   exclude-rules:
     - path: pkg/plugins/
       linters: