fix: Update golangci-lint config to v2 format

- Migrate to golangci-lint v2.x config schema
- Move settings under linters.settings
- Move exclusions under linters.exclusions
- Add version: "2" to config
- Fix validation errors

.golangci.yml

@@ -1,28 +1,20 @@
-version: 2
+version: "2"
 
 run:
   timeout: 5m
   tests: false
 
 linters:
-  disable:
+  default: 'none'
-    - dupl
-    - goconst
-    - revive
   enable:
     - errcheck
     - gosec
-    # - gocyclo  # Disabled: high complexity acceptable for large functions (see LINTING.md)
     - misspell
     - unconvert
     - unparam
 
-linters-settings:
+  settings:
-  dupl:
-    threshold: 100
     errcheck:
-    check-type-assertions: false
-    check-blank: false
       exclude-functions:
         - (*database/sql.DB).Close
         - (*database/sql.Rows).Close
@@ -36,25 +28,13 @@ linters-settings:
         - (os).Unsetenv
         - (os).Chdir
         - (os).MkdirAll
-  goconst:
-    min-len: 3
-    min-occurrences: 3
-  gocyclo:
-    min-complexity: 15
     misspell:
       locale: US
-  revive:
-    rules:
-      - name: var-naming
-      - name: exported
 
-issues:
+  exclusions:
-  exclude-patterns:
+    rules:
-    - "var-naming: avoid meaningless package names"
-    - "exported.*SQLiteStorage.*stutters"
-  exclude-rules:
       # G304: File inclusion via variable in tests is safe (test data)
-    - path: _test\.go
+      - path: '_test\.go'
         linters:
           - gosec
         text: "G304.*file inclusion via variable"
@@ -63,7 +43,7 @@ issues:
           - gosec
         text: "G302.*0700|G301.*0750"
       # G306: Git hooks must be executable (0700)
-    - path: cmd/bd/init\.go
+      - path: 'cmd/bd/init\.go'
         linters:
           - gosec
         text: "G306.*0700"
@@ -72,7 +52,10 @@ issues:
           - gosec
         text: 'G204.*git.*show|G204.*daemon'
       # errcheck: Ignore unchecked errors in test files for common cleanup patterns
-    - path: _test\.go
+      - path: '_test\.go'
         linters:
           - errcheck
         text: "Error return value of .*(Close|Rollback|RemoveAll|Setenv|Unsetenv|Chdir|MkdirAll|Remove|Write|SetReadDeadline|SetDeadline|Start|Stop).* is not checked"
+
+issues:
+  uniq-by-line: true