feat(lsp): add textDocument/rangeFormatting support

Advertise DocumentRangeFormattingProvider in server capabilities and
implement rangeFormat: formats the complete document, then returns an
edit covering only the minimal changed-line region that overlaps the
client's selection. Also includes gofmt alignment fixes across lint
and format packages.

pkg/lint/rules_naming.go

@@ -22,7 +22,7 @@ func isSnakeCase(s string) bool {
 // NAM001 — table names must be snake_case.
 type ruleNAM001 struct{}
 
-func (ruleNAM001) ID() string                    { return "NAM001" }
+func (ruleNAM001) ID() string                     { return "NAM001" }
 func (ruleNAM001) Severity() diagnostics.Severity { return diagnostics.SeverityHint }
 
 func (ruleNAM001) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {
@@ -51,7 +51,7 @@ func (ruleNAM001) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Dia
 // NAM002 — column names in CREATE TABLE must be snake_case.
 type ruleNAM002 struct{}
 
-func (ruleNAM002) ID() string                    { return "NAM002" }
+func (ruleNAM002) ID() string                     { return "NAM002" }
 func (ruleNAM002) Severity() diagnostics.Severity { return diagnostics.SeverityHint }
 
 func (ruleNAM002) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {
@@ -86,7 +86,7 @@ func (ruleNAM002) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Dia
 // NAM003 — function/procedure names must be snake_case.
 type ruleNAM003 struct{}
 
-func (ruleNAM003) ID() string                    { return "NAM003" }
+func (ruleNAM003) ID() string                     { return "NAM003" }
 func (ruleNAM003) Severity() diagnostics.Severity { return diagnostics.SeverityHint }
 
 func (ruleNAM003) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {