i18n: 全部用户可见字符串统一为英文（46个文件）

- 所有Command/Tool/Core/MCP/Plugin中的中文提示改为英文
- Javadoc注释和行内注释保留中文不变
- AI提示词（compact/commit/review等）改为英文
- 编译验证通过

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/java/com/claudecode/context/ClaudeMdLoader.java

@@ -62,7 +62,7 @@ public class ClaudeMdLoader {
                         .sorted()
                         .forEach(p -> loadFile(p, "rule").ifPresent(sections::add));
             } catch (IOException e) {
-                log.debug("加载规则目录失败: {}", e.getMessage());
+                log.debug("Failed to load rules directory: {}", e.getMessage());
             }
         }
 
@@ -80,11 +80,11 @@ public class ClaudeMdLoader {
         try {
             String content = Files.readString(path, StandardCharsets.UTF_8).strip();
             if (!content.isEmpty()) {
-                log.debug("已加载 {} 级 CLAUDE.md: {}", level, path);
+                log.debug("Loaded {} level CLAUDE.md: {}", level, path);
                 return java.util.Optional.of(content);
             }
         } catch (IOException e) {
-            log.warn("读取 {} 失败: {}", path, e.getMessage());
+            log.warn("Failed to read {}: {}", path, e.getMessage());
         }
         return java.util.Optional.empty();
     }

src/main/java/com/claudecode/context/GitContext.java

@@ -36,7 +36,7 @@ public class GitContext {
      */
     public GitContext collect() {
         if (!isGitRepo) {
-            log.debug("当前目录不是 Git 仓库: {}", projectDir);
+            log.debug("Current directory is not a Git repository: {}", projectDir);
             return this;
         }
 
@@ -114,7 +114,7 @@ public class GitContext {
             return output.toString().stripTrailing();
 
         } catch (Exception e) {
-            log.debug("Git 命令执行失败: {}", e.getMessage());
+            log.debug("Git command execution failed: {}", e.getMessage());
             return "";
         }
     }

src/main/java/com/claudecode/context/SkillLoader.java

@@ -58,7 +58,7 @@ public class SkillLoader {
         Path commandsDir = projectDir.resolve(".claude").resolve("commands");
         loadFromDirectory(commandsDir, "command");
 
-        log.debug("共加载 {} 个技能", skills.size());
+        log.debug("Loaded {} skills in total", skills.size());
         return Collections.unmodifiableList(skills);
     }
 
@@ -77,13 +77,13 @@ public class SkillLoader {
                         try {
                             Skill skill = parseSkillFile(p, source);
                             skills.add(skill);
-                            log.debug("加载技能: {} [{}] from {}", skill.name(), source, p.getFileName());
+                            log.debug("Loaded skill: {} [{}] from {}", skill.name(), source, p.getFileName());
                         } catch (IOException e) {
-                            log.warn("加载技能文件失败: {}: {}", p, e.getMessage());
+                            log.warn("Failed to load skill file: {}: {}", p, e.getMessage());
                         }
                     });
         } catch (IOException e) {
-            log.debug("扫描技能目录失败: {}: {}", dir, e.getMessage());
+            log.debug("Failed to scan skill directory: {}: {}", dir, e.getMessage());
         }
     }