feat: add HTML email body for --send (#48)

Add email.html config flag (default false). When enabled, --send
includes an HTML version of the report body generated via HTMLFormatter
alongside the plain-text part in a multipart/alternative message.

- EmailConfig gains html: bool field
- mailer.build_message/send_report accept rows for HTML generation
- CLI passes rows to send_report
- --init-config generates email.html: false
- README.md and docs/CONFIG.md updated

Bump version to 1.10.0.

Closes #48

redmine_reporter/mailer.py

@@ -6,10 +6,11 @@ import smtplib
 from email.mime.application import MIMEApplication
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-from typing import Dict
+from typing import Dict, List
 
 from .client import RedmineAPIError
 from .config import EmailConfig
+from .types import ReportRow
 
 # Use 8bit transfer encoding for UTF-8 so non-ASCII text (e.g. Russian)
 # appears literally in MIME output instead of base64.
@@ -33,13 +34,22 @@ def _resolve_mime_type(file_path: str) -> str:
     return MIME_TYPES.get(ext, "application/octet-stream")
 
 
+def _build_html_body(rows: List[ReportRow]) -> str:
+    """Генерирует HTML-версию тела письма через HTMLFormatter."""
+    from .formatters.html import HTMLFormatter
+
+    formatter = HTMLFormatter()
+    return formatter.format(rows)
+
+
 def build_message(
     email_config: EmailConfig,
     file_path: str,
     author: str,
     period: str,
+    rows: List[ReportRow],
 ) -> MIMEMultipart:
-    """Формирует MIME-письмо с подстановками и вложением."""
+    """Формирует MIME-письмо с подстановками, телами и вложением."""
     subject = email_config.subject.replace("{author}", author).replace(
         "{period}", period
     )
@@ -54,7 +64,15 @@ def build_message(
     if email_config.cc:
         msg["Cc"] = ", ".join(email_config.cc)
 
-    msg.attach(MIMEText(body, "plain", "utf-8"))
+    # Тела письма: plain-text всегда, HTML по флагу
+    body_container = MIMEMultipart("alternative")
+    body_container.attach(MIMEText(body, "plain", "utf-8"))
+
+    if email_config.html:
+        html_body = _build_html_body(rows)
+        body_container.attach(MIMEText(html_body, "html", "utf-8"))
+
+    msg.attach(body_container)
 
     if email_config.attach:
         try:
@@ -81,6 +99,7 @@ def send_report(
     file_path: str,
     author: str,
     period: str,
+    rows: List[ReportRow],
 ) -> None:
     """Отправляет сгенерированный отчёт по email через SMTP.
 
@@ -89,12 +108,13 @@ def send_report(
         file_path: Путь к файлу отчёта для вложения.
         author: Имя автора (для подстановки в тему/тело).
         period: Строка периода (для подстановки в тему/тело).
+        rows: Строки отчёта (для HTML-версии тела письма).
 
     Raises:
         RedmineAPIError: При любой ошибке соединения или отправки.
     """
     smtp_cfg = email_config.smtp
-    msg = build_message(email_config, file_path, author, period)
+    msg = build_message(email_config, file_path, author, period, rows)
     all_recipients = (
         list(email_config.to) + list(email_config.cc) + list(email_config.bcc)
     )