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/docker_api/server.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+"""
+Docker APIserver.
+Serves a fake Docker REST API on port 2375. Responds to common recon
+endpoints (/version, /info, /containers/json, /images/json) 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", "docker-host")
+SERVICE_NAME   = "docker_api"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+app = Flask(__name__)
+
+_VERSION = {
+    "Version": "24.0.5",
+    "ApiVersion": "1.43",
+    "MinAPIVersion": "1.12",
+    "GitCommit": "ced0996",
+    "GoVersion": "go1.20.6",
+    "Os": "linux",
+    "Arch": "amd64",
+    "KernelVersion": "5.15.0-76-generic",
+}
+
+_INFO = {
+    "ID": "FAKE:FAKE:FAKE:FAKE",
+    "Containers": 3,
+    "ContainersRunning": 3,
+    "Images": 7,
+    "Driver": "overlay2",
+    "MemoryLimit": True,
+    "SwapLimit": True,
+    "KernelMemory": False,
+    "Name": NODE_NAME,
+    "DockerRootDir": "/var/lib/docker",
+    "HttpProxy": "",
+    "HttpsProxy": "",
+    "NoProxy": "",
+    "ServerVersion": "24.0.5",
+}
+
+_CONTAINERS = [
+    {
+        "Id": "a1b2c3d4e5f6",
+        "Names": ["/webapp"],
+        "Image": "nginx:latest",
+        "State": "running",
+        "Status": "Up 3 days",
+        "Ports": [{"IP": "0.0.0.0", "PrivatePort": 80, "PublicPort": 8080, "Type": "tcp"}],  # nosec B104
+    }
+]
+
+
+
+
+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,
+        body=request.get_data(as_text=True)[:512],
+    )
+
+
+@app.route("/version")
+@app.route("/<ver>/version")
+def version(ver=None):
+    return app.response_class(json.dumps(_VERSION), mimetype="application/json")
+
+
+@app.route("/info")
+@app.route("/<ver>/info")
+def info(ver=None):
+    return app.response_class(json.dumps(_INFO), mimetype="application/json")
+
+
+@app.route("/containers/json")
+@app.route("/<ver>/containers/json")
+def containers(ver=None):
+    return app.response_class(json.dumps(_CONTAINERS), mimetype="application/json")
+
+
+@app.route("/images/json")
+@app.route("/<ver>/images/json")
+def images(ver=None):
+    return app.response_class(json.dumps([]), mimetype="application/json")
+
+
+@app.route("/", defaults={"path": ""})
+@app.route("/<path:path>", methods=["GET", "POST", "PUT", "DELETE"])
+def catch_all(path):
+    return app.response_class(
+        json.dumps({"message": "page not found", "response": 404}),
+        status=404,
+        mimetype="application/json",
+    )
+
+
+if __name__ == "__main__":
+    _log("startup", msg=f"Docker API server starting as {NODE_NAME}")
+    app.run(host="0.0.0.0", port=2375, debug=False)  # nosec B104