feat(lsp): add workspace symbol search

Assisted-by: MiMo V2.5 Pro

lsp/protocol.go

@@ -312,6 +312,7 @@ type ServerCapabilities struct {
 	DocumentHighlightProvider  bool           `json:"documentHighlightProvider,omitempty"`
 	CodeActionProvider         bool           `json:"codeActionProvider,omitempty"`
 	SignatureHelpProvider      map[string]any `json:"signatureHelpProvider,omitempty"`
+	WorkspaceSymbolProvider    bool           `json:"workspaceSymbolProvider,omitempty"`
 	SemanticTokensProvider     map[string]any `json:"semanticTokensProvider,omitempty"`
 	InlayHintProvider          bool           `json:"inlayHintProvider,omitempty"`
 	DiagnosticProvider         map[string]any `json:"diagnosticProvider,omitempty"`
@@ -378,6 +379,19 @@ const (
 	highlightWrite = 2
 )
 
+// --- workspace symbols -------------------------------------------------------
+
+type workspaceSymbolParams struct {
+	Query string `json:"query"`
+}
+
+// WorkspaceSymbol represents a symbol found across the workspace.
+type WorkspaceSymbol struct {
+	Name     string   `json:"name"`
+	Kind     int      `json:"kind"`
+	Location Location `json:"location"`
+}
+
 type initializeResult struct {
 	Capabilities ServerCapabilities `json:"capabilities"`
 	ServerInfo   map[string]string  `json:"serverInfo,omitempty"`