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/k8s/server.py

@@ -0,0 +1,127 @@
+#!/usr/bin/env python3
+"""
+Kubernetes APIserver.
+Serves a fake K8s REST API on port 6443 (HTTPS-ish, plain HTTP) and 8080.
+Responds to recon endpoints (/version, /api, /apis, /api/v1/namespaces,
+/api/v1/pods) with plausible but fake data. Logs all requests as JSON.
+"""
+
+import json
+import os
+
+from flask import Flask, request
+from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+
+NODE_NAME = os.environ.get("NODE_NAME", "k8s-master")
+SERVICE_NAME   = "k8s"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+app = Flask(__name__)
+
+_VERSION = {
+    "major": "1",
+    "minor": "27",
+    "gitVersion": "v1.27.4",
+    "gitCommit": "fa3d7990104d7c1f16943a67f11b154b71f6a132",
+    "gitTreeState": "clean",
+    "buildDate": "2023-07-19T12:14:46Z",
+    "goVersion": "go1.20.6",
+    "compiler": "gc",
+    "platform": "linux/amd64",
+}
+
+_API_VERSIONS = {
+    "kind": "APIVersions",
+    "versions": ["v1"],
+    "serverAddressByClientCIDRs": [{"clientCIDR": "0.0.0.0/0", "serverAddress": f"{NODE_NAME}:6443"}],
+}
+
+_NAMESPACES = {
+    "kind": "NamespaceList",
+    "apiVersion": "v1",
+    "items": [
+        {"metadata": {"name": "default"}},
+        {"metadata": {"name": "kube-system"}},
+        {"metadata": {"name": "production"}},
+    ],
+}
+
+_PODS = {
+    "kind": "PodList",
+    "apiVersion": "v1",
+    "items": [
+        {"metadata": {"name": "webapp-6d5f8b9-xk2p7", "namespace": "production"},
+         "status": {"phase": "Running"}},
+    ],
+}
+
+_SECRETS = {
+    "kind": "Status",
+    "apiVersion": "v1",
+    "status": "Failure",
+    "message": "secrets is forbidden: User \"system:anonymous\" cannot list resource \"secrets\"",
+    "reason": "Forbidden",
+    "code": 403,
+}
+
+
+
+
+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)
+
+
+@app.before_request
+def log_request():
+    _log(
+        "request",
+        method=request.method,
+        path=request.path,
+        remote_addr=request.remote_addr,
+        auth=request.headers.get("Authorization", ""),
+        body=request.get_data(as_text=True)[:512],
+    )
+
+
+@app.route("/version")
+def version():
+    return app.response_class(json.dumps(_VERSION), mimetype="application/json")
+
+
+@app.route("/api")
+def api():
+    return app.response_class(json.dumps(_API_VERSIONS), mimetype="application/json")
+
+
+@app.route("/api/v1/namespaces")
+def namespaces():
+    return app.response_class(json.dumps(_NAMESPACES), mimetype="application/json")
+
+
+@app.route("/api/v1/pods")
+@app.route("/api/v1/namespaces/<ns>/pods")
+def pods(ns="default"):
+    return app.response_class(json.dumps(_PODS), mimetype="application/json")
+
+
+@app.route("/api/v1/secrets")
+@app.route("/api/v1/namespaces/<ns>/secrets")
+def secrets(ns="default"):
+    return app.response_class(json.dumps(_SECRETS), status=403, mimetype="application/json")
+
+
+@app.route("/", defaults={"path": ""})
+@app.route("/<path:path>", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
+def catch_all(path):
+    return app.response_class(
+        json.dumps({"kind": "Status", "status": "Failure", "code": 404}),
+        status=404,
+        mimetype="application/json",
+    )
+
+
+if __name__ == "__main__":
+    _log("startup", msg=f"Kubernetes API server starting as {NODE_NAME}")
+    app.run(host="0.0.0.0", port=6443, debug=False)  # nosec B104