feat: status translation overrides via YAML config

report.status_translation in YAML config overrides/extends the builtin
STATUS_TRANSLATION dictionary; without the section behavior is unchanged.

- AppConfig.report_status_translation + _resolve_str_dict (warns and
  skips non-scalar values, resolves ${VAR} references)
- Config.get_status_translation() returns merged copy (lazy import,
  builtin dict never mutated)
- build_grouped_report() accepts optional status_translation parameter
- --init-config template gains commented example, docs/CONFIG.md updated

Closes #65

redmine_reporter/config.py

@@ -4,7 +4,7 @@ import sys
 from dataclasses import dataclass, field
 from datetime import date, timedelta
 from pathlib import Path
-from typing import Union
+from typing import Dict, Union
 
 import yaml
 from dotenv import load_dotenv
@@ -62,6 +62,7 @@ class AppConfig:
     output_filename: str = "{author}_{from}_{to}.{ext}"
     output_default_format: str = "xlsx"
     report_no_time: bool = False
+    report_status_translation: Dict[str, str] = field(default_factory=dict)
     email: EmailConfig = field(default_factory=EmailConfig)
 
     @classmethod
@@ -111,6 +112,9 @@ class AppConfig:
             output_default_format=cls._resolve_str(raw, "output", "default_format")
             or "xlsx",
             report_no_time=cls._resolve_bool(raw, "report", "no_time"),
+            report_status_translation=cls._resolve_str_dict(
+                raw, "report", "status_translation"
+            ),
             email=cls._resolve_email(raw),
         )
 
@@ -140,6 +144,43 @@ class AppConfig:
             return ""
         return str(value)
 
+    @staticmethod
+    def _resolve_str_dict(raw: dict, section: str, key: str) -> Dict[str, str]:
+        """Читает вложенный mapping строк из YAML-секции.
+
+        Не-mapping значение логируется с warning и игнорируется.
+        Ключи и значения приводятся к str, ${VAR} в значениях резолвится.
+        Записи со значением null или не-scalar (dict/list) пропускаются
+        с warning — иначе null стал бы строкой "None", а dict — repr.
+        """
+        section_value = raw.get(section)
+        if not isinstance(section_value, dict):
+            return {}
+        value = section_value.get(key)
+        if value is None:
+            return {}
+        if not isinstance(value, dict):
+            logger.warning(
+                "Config %s.%s must be a mapping, got %s — ignoring",
+                section,
+                key,
+                type(value).__name__,
+            )
+            return {}
+        result: Dict[str, str] = {}
+        for k, v in value.items():
+            if v is None or isinstance(v, (dict, list)):
+                logger.warning(
+                    "Config %s.%s entry %r must be a scalar, got %s — skipping",
+                    section,
+                    key,
+                    k,
+                    type(v).__name__,
+                )
+                continue
+            result[str(k)] = resolve_env_vars(str(v))
+        return result
+
     @staticmethod
     def _resolve_bool(raw: dict, section: str, key: str) -> bool:
         value = raw.get(section, {}).get(key)
@@ -367,6 +408,18 @@ class Config:
             return cls._app.report_no_time
         return False
 
+    @classmethod
+    def get_status_translation(cls) -> Dict[str, str]:
+        """Полный словарь перевода статусов: встроенный + переопределения из YAML.
+
+        Возвращает новый словарь — модульный STATUS_TRANSLATION не мутируется.
+        Импорт ленивый: config.py не должен тянуть redminelib при импорте.
+        """
+        from .report_builder import STATUS_TRANSLATION
+
+        overrides = cls._app.report_status_translation if cls._app else {}
+        return {**STATUS_TRANSLATION, **overrides}
+
     @classmethod
     def get_email_config(cls) -> "EmailConfig | None":
         """Возвращает EmailConfig из YAML-конфига или None, если не настроен."""