✨ feat(lsp_server): implement missing providers and json coverage

Implement workspace configuration/folders and apply WorkspaceEdit.changes.

Strengthen provider JSON coverage (all methods require params, no errors).

Verified: Release test_provider

lsp-server/test/test_provider/CMakeLists.txt

@@ -23,6 +23,7 @@ set(SOURCES
     fixtures.cppm
     completion_test.cppm
     json_flow_test.cppm
+    json_provider_coverage_test.cppm
     definitions_test.cppm
     provider_misc_test.cppm
     provider_surface_test.cppm
@@ -49,6 +50,7 @@ target_sources(
                              ${CMAKE_CURRENT_SOURCE_DIR}/fixtures.cppm
                              ${CMAKE_CURRENT_SOURCE_DIR}/completion_test.cppm
                              ${CMAKE_CURRENT_SOURCE_DIR}/json_flow_test.cppm
+                             ${CMAKE_CURRENT_SOURCE_DIR}/json_provider_coverage_test.cppm
                              ${CMAKE_CURRENT_SOURCE_DIR}/definitions_test.cppm
                              ${CMAKE_CURRENT_SOURCE_DIR}/provider_misc_test.cppm
                              ${CMAKE_CURRENT_SOURCE_DIR}/provider_surface_test.cppm
@@ -121,6 +123,8 @@ target_sources(
                              ../../src/protocol/types.cppm
                              ../../src/protocol/protocol.cppm
                              ../../src/provider/base/interface.cppm
+                             ../../src/provider/base/registry.cppm
+                             ../../src/provider/manifest.cppm
                              ../../src/provider/text_document/completion.cppm
                              ../../src/provider/text_document/definition.cppm
                              ../../src/provider/text_document/did_open.cppm