plugins/windsurf-nvim: rename codeium-nvim

Rename plugin, use new packpathname, and update deprecations to point
from old name to new name.

tests/test-sources/plugins/by-name/windsurf-nvim/default.nix

@@ -0,0 +1,79 @@
+{
+  empty = {
+    plugins.windsurf-nvim = {
+      enable = true;
+      settings.enable_cmp_source = false;
+    };
+  };
+
+  enabled-by-cmp = {
+    plugins.cmp = {
+      enable = true;
+
+      settings.sources = [ { name = "codeium"; } ];
+    };
+  };
+
+  defaults = {
+    plugins = {
+      cmp.enable = true;
+
+      windsurf-nvim = {
+        enable = true;
+
+        settings = {
+          manager_path = null;
+          bin_path.__raw = "vim.fn.stdpath('cache') .. '/codeium/bin'";
+          config_path.__raw = "vim.fn.stdpath('cache') .. '/codeium/config.json'";
+          language_server_download_url = "https://github.com";
+          api = {
+            host = "server.codeium.com";
+            port = "443";
+            path = "/";
+            portal_url = "codeium.com";
+          };
+          enterprise_mode = null;
+          detect_proxy = null;
+          tools = { };
+          wrapper = null;
+          enable_chat = true;
+          enable_local_search = true;
+          enable_index_service = true;
+          search_max_workspace_file_count = 5000;
+          file_watch_max_dir_count = 50000;
+          enable_cmp_source = true;
+          virtual_text = {
+            enabled = false;
+            filetypes = [ ];
+            default_filetype_enabled = true;
+            manual = false;
+            idle_delay = 75;
+            virtual_text_priority = 65535;
+            map_keys = true;
+            accept_fallback = null;
+            key_bindings = {
+              accept = "<Tab>";
+              accept_word = false;
+              accept_line = false;
+              clear = false;
+              next = "<M-]>";
+              prev = "<M-[>";
+            };
+          };
+          workspace_root = {
+            use_lsp = true;
+            find_root = null;
+            paths = [
+              ".bzr"
+              ".git"
+              ".hg"
+              ".svn"
+              "_FOSSIL_"
+              "package.json"
+            ];
+          };
+        };
+      };
+    };
+  };
+}