feat: add 19 fast commands (no-LLM) + incremental embeddings indexing

Fast commands for git, email, calendar, notes, search, reminders, and
diagnostics — all execute instantly without Claude CLI. Incremental
embeddings indexing in heartbeat (1h cooldown) + inline indexing after
/note, /jurnal, /email save. Fix Ollama URL (localhost → 10.0.20.161),
fix email_process.py KB path (kb/ → memory/kb/).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/router.py

@@ -4,6 +4,7 @@ import logging
 from typing import Callable
 
 from src.config import Config
+from src.fast_commands import dispatch as fast_dispatch
 from src.claude_session import (
     send_message,
     clear_session,
@@ -59,7 +60,13 @@ def route_message(
         return _model_command(channel_id, text), True
 
     if text.startswith("/"):
-        return f"Unknown command: {text.split()[0]}", True
+        parts = text[1:].split()
+        cmd_name = parts[0].lower()
+        cmd_args = parts[1:]
+        result = fast_dispatch(cmd_name, cmd_args)
+        if result is not None:
+            return result, True
+        return f"Unknown command: /{cmd_name}", True
 
     # Regular message → Claude
     if not model: