Upgrade golangci-lint to v2 and apply go fix for Go 1.26

- Migrate .golangci.yml to v2 format (gofmt moved to formatters section)
- Upgrade golangci-lint from v1.64.5 to v2.10.1
- Apply go fix: strings.Split -> strings.SplitSeq (Go 1.26 iterators)

Author: firecow

.github/workflows/quality-assurance.yml

@@ -16,7 +16,7 @@ jobs:
           go-version: "1.26"
       - uses: golangci/golangci-lint-action@55c2c1448f86e01eaae002a5a3a9624417608d84 # v6
         with:
-          version: v1.64.5
+          version: v2.10.1
 
   tidy:
     runs-on: ubuntu-24.04

.golangci.yml

@@ -1,3 +1,9 @@
+version: "2"
+
+formatters:
+  enable:
+    - gofmt
+
 linters:
   enable:
     - bodyclose
@@ -6,7 +12,6 @@ linters:
     - errorlint
     - gocognit
     - gocritic
-    - gofmt
     - gosec
     - govet
     - ineffassign
@@ -19,25 +24,24 @@ linters:
     - unparam
     - unused
     - wastedassign
-
-linters-settings:
-  gocognit:
-    min-complexity: 30
-  revive:
-    rules:
-      - name: blank-imports
-      - name: context-as-argument
-      - name: dot-imports
-      - name: error-return
-      - name: error-strings
-      - name: exported
-        disabled: true
-      - name: increment-decrement
-      - name: indent-error-flow
-      - name: range
-      - name: receiver-naming
-      - name: redefines-builtin-id
-      - name: time-naming
-      - name: unexported-return
-      - name: var-declaration
-      - name: var-naming
+  settings:
+    gocognit:
+      min-complexity: 30
+    revive:
+      rules:
+        - name: blank-imports
+        - name: context-as-argument
+        - name: dot-imports
+        - name: error-return
+        - name: error-strings
+        - name: exported
+          disabled: true
+        - name: increment-decrement
+        - name: indent-error-flow
+        - name: range
+        - name: receiver-naming
+        - name: redefines-builtin-id
+        - name: time-naming
+        - name: unexported-return
+        - name: var-declaration
+        - name: var-naming

internal/king/king.go

@@ -61,7 +61,7 @@ func parseTunnelArgs(args []string) ([]tunnelConfig, error) {
 	configs := make([]tunnelConfig, 0, len(args))
 	for _, arg := range args {
 		pairs := make(map[string]string)
-		for _, pair := range strings.Split(arg, " ") {
+		for pair := range strings.SplitSeq(arg, " ") {
 			parts := strings.SplitN(pair, "=", 2)
 			if len(parts) == 2 {
 				pairs[parts[0]] = parts[1]

internal/ling/ling.go

@@ -69,7 +69,7 @@ func parseTunnelArgs(args []string) ([]tunnelConfig, error) {
 	configs := make([]tunnelConfig, 0, len(args))
 	for _, arg := range args {
 		pairs := make(map[string]string)
-		for _, pair := range strings.Split(arg, " ") {
+		for pair := range strings.SplitSeq(arg, " ") {
 			parts := strings.SplitN(pair, "=", 2)
 			if len(parts) == 2 {
 				pairs[parts[0]] = parts[1]
@@ -97,7 +97,7 @@ func parseProxyArgs(args []string) ([]proxyConfig, error) {
 	configs := make([]proxyConfig, 0, len(args))
 	for _, arg := range args {
 		pairs := make(map[string]string)
-		for _, pair := range strings.Split(arg, " ") {
+		for pair := range strings.SplitSeq(arg, " ") {
 			parts := strings.SplitN(pair, "=", 2)
 			if len(parts) == 2 {
 				pairs[parts[0]] = parts[1]