fix(packaging): move templates/ into decnet/ package so they ship with pip install

The docker build contexts and syslog_bridge.py lived at repo root, which
meant setuptools (include = ["decnet*"]) never shipped them. Agents
installed via `pip install $RELEASE_DIR` got site-packages/decnet/** but no
templates/, so every deploy blew up in deployer._sync_logging_helper with
FileNotFoundError on templates/syslog_bridge.py.

Move templates/ -> decnet/templates/ and declare it as setuptools
package-data. Path resolutions in services/*.py and engine/deployer.py drop
one .parent since templates now lives beside the code. Test fixtures,
bandit exclude path, and coverage omit glob updated to match.

decnet/templates/ftp/server.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+"""
+FTP server using Twisted's FTP server infrastructure.
+Accepts any credentials, logs all commands and file requests,
+forwards events as JSON to LOG_TARGET if set.
+"""
+
+import os
+from pathlib import Path
+
+from twisted.internet import defer, reactor
+from twisted.protocols.ftp import FTP, FTPFactory, FTPAnonymousShell
+from twisted.python.filepath import FilePath
+from twisted.python import log as twisted_log
+from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+
+NODE_NAME = os.environ.get("NODE_NAME", "ftpserver")
+SERVICE_NAME   = "ftp"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+PORT = int(os.environ.get("PORT", "21"))
+BANNER = os.environ.get("FTP_BANNER", "220 (vsFTPd 3.0.3)")
+
+def _log(event_type: str, severity: int = 6, **kwargs) -> None:
+    line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
+    write_syslog_file(line)
+    forward_syslog(line, LOG_TARGET)
+
+def _setup_bait_fs() -> str:
+    bait_dir = Path("/tmp/ftp_bait")
+    bait_dir.mkdir(parents=True, exist_ok=True)
+
+    (bait_dir / "backup.tar.gz").write_bytes(b"\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x03\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00")
+    (bait_dir / "db_dump.sql").write_text("CREATE TABLE users (id INT, username VARCHAR(50), password VARCHAR(50));\nINSERT INTO users VALUES (1, 'admin', 'pbkdf2:sha256:5000$...');\n")
+    (bait_dir / "config.ini").write_text("[database]\nuser = dbadmin\npassword = db_super_admin_pass_!\nhost = localhost\n")
+    (bait_dir / "credentials.txt").write_text("admin:super_secret_admin_pw\nroot:toor\nalice:wonderland\n")
+
+    return str(bait_dir)
+
+class ServerFTP(FTP):
+    def connectionMade(self):
+        peer = self.transport.getPeer()
+        _log("connection", src_ip=peer.host, src_port=peer.port)
+        super().connectionMade()
+
+    def ftp_USER(self, username):
+        self._server_user = username
+        _log("user", username=username)
+        return super().ftp_USER(username)
+
+    def ftp_PASS(self, password):
+        _log("auth_attempt", username=getattr(self, "_server_user", "?"), password=password)
+        # Accept everything — we're a honeypot server
+        self.state = self.AUTHED
+        self._user = getattr(self, "_server_user", "anonymous")
+        self.shell = FTPAnonymousShell(FilePath(_setup_bait_fs()))
+        return defer.succeed((230, "Login successful."))
+
+    def ftp_RETR(self, path):
+        _log("download_attempt", path=path)
+        return super().ftp_RETR(path)
+
+    def connectionLost(self, reason):
+        peer = self.transport.getPeer()
+        _log("disconnect", src_ip=peer.host, src_port=peer.port)
+        super().connectionLost(reason)
+
+class ServerFTPFactory(FTPFactory):
+    protocol = ServerFTP
+    welcomeMessage = BANNER
+
+if __name__ == "__main__":
+    twisted_log.startLoggingWithObserver(lambda e: None, setStdout=False)
+    _log("startup", msg=f"FTP server starting as {NODE_NAME} on port {PORT}")
+    reactor.listenTCP(PORT, ServerFTPFactory())
+    reactor.run()