🔧 chore(cpp): trim clang-format to intentional google deviations

- keep only the options that differ from Google style, each annotated with
  the Google default, so every override carries its own rationale
- switch to Allman braces and a 120 column limit; short functions now
  collapse only when declared inline
- dropped overrides fall back to Google behaviour, which turns include
  sorting, argument binpacking, comment reflow and namespace comment
  fixing back on
- drop a stray trailing blank line in .clangd

templates/cpp/.clang-format

@@ -2,46 +2,10 @@
 Language: Cpp
 BasedOnStyle: Google
 
-# Keep consistent with the repo-wide 100 char guidance (adjust per-project if needed).
-ColumnLimit: 100
-IndentWidth: 4
-
-AccessModifierOffset: -4
-AlignEscapedNewlines: Left
-AlignTrailingComments: false
-AllowAllParametersOfDeclarationOnNextLine: false
-AllowShortFunctionsOnASingleLine: All
-AlwaysBreakTemplateDeclarations: Yes
-BinPackArguments: false
-BinPackParameters: false
-BraceWrapping:
-  AfterCaseLabel: true
-  AfterUnion: true
-  AfterExternBlock: false
-BreakBeforeTernaryOperators: false
-BreakConstructorInitializers: AfterColon
-BreakInheritanceList: AfterColon
-CommentPragmas: "suppress"
-ConstructorInitializerAllOnOneLineOrOnePerLine: true
-Cpp11BracedListStyle: false
-FixNamespaceComments: false
-IncludeBlocks: Regroup
-IncludeCategories:
-  - Regex: '^.*(precomp|pch|stdafx)'
-    Priority: -1
-  - Regex: '^".*"'
-    Priority: 1
-  - Regex: '^<.*>'
-    Priority: 2
-  - Regex: '.*'
-    Priority: 3
-KeepEmptyLinesAtTheStartOfBlocks: false
-MacroBlockBegin: "BEGIN_TEST_METHOD_PROPERTIES|BEGIN_MODULE|BEGIN_TEST_CLASS|BEGIN_TEST_METHOD"
-MacroBlockEnd: "END_TEST_METHOD_PROPERTIES|END_MODULE|END_TEST_CLASS|END_TEST_METHOD"
-NamespaceIndentation: None
-PointerAlignment: Left
-ReflowComments: false
-SortIncludes: false
-SpaceAfterTemplateKeyword: false
-SpacesInAngles: false
-SpacesInContainerLiterals: false
+# --- intentional deviations from Google C++ defaults ---
+ColumnLimit: 120          # Google: 80
+IndentWidth: 4            # Google: 2
+TabWidth: 4               # Google/LLVM: 8（UseTab: Never 时几乎无感，与缩进对齐）
+AccessModifierOffset: -4  # Google: -1（配合 IndentWidth 4，使 public/private 与 class 同级）
+BreakBeforeBraces: Allman # Google: Attach
+AllowShortFunctionsOnASingleLine: Inline # 需要显示Inline

templates/cpp/.clangd

@@ -22,4 +22,3 @@ CompileFlags:
   Add:
     - "-std=c17"
   Compiler: clang
-