feat: interactive inline buttons, SMTP reply, AI reply suggestions

- Inline keyboard: view original / back to summary toggle per message
- SMTP config per account for sending replies
- Reply button: click, type message, auto-send via SMTP
- AI Reply button: generates 3 suggestions via DeepSeek
  - Simple replies (OK, Got it) send immediately on tap
  - Substantive replies require confirm before send
  - Hides AI Reply button when AI determines reply unnecessary
- Telegram long polling integrated into main loop for real-time interaction

src/config.py

@@ -1,14 +1,23 @@
-from dataclasses import dataclass, field
-from typing import List
+from dataclasses import dataclass
+from typing import List, Optional
 import yaml
 
 
+@dataclass
+class SmtpConfig:
+    server: str
+    port: int
+    use_ssl: bool = True
+    use_starttls: bool = False
+
+
 @dataclass
 class EmailAccount:
     imap_server: str
     imap_port: int
     username: str
     password: str
+    smtp: Optional[SmtpConfig] = None
 
 
 @dataclass
@@ -41,7 +50,11 @@ def load_config(path: str) -> Config:
     with open(path, "r", encoding="utf-8") as f:
         raw = yaml.safe_load(f)
 
-    accounts = [EmailAccount(**a) for a in raw["email_accounts"]]
+    accounts = []
+    for a in raw["email_accounts"]:
+        if "smtp" in a and a["smtp"] is not None:
+            a["smtp"] = SmtpConfig(**a["smtp"])
+        accounts.append(EmailAccount(**a))
     ai = AIConfig(**raw["ai"])
     tg = TelegramConfig(**raw["telegram"])
     polling = PollingConfig(**raw["polling"])