Seed: Angular workspace (web/) for frontend tasks

ng new defaults, Angular 22.1, vitest unit-test builder — npm test runs
once and green under CI.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/.editorconfig

@@ -0,0 +1,17 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+ij_typescript_use_double_quotes = false
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false