Zabbix supply backend rebuild + data-driven model supplies

Rewrite the printer Zabbix integration (Bearer auth, host-by-IP, tag-based
supply lookup, ping) and replace the hardcoded toner table with a
modelsupplies table + CRUD + seed. Add mock Zabbix server, live test
harness, and the Playwright screenshot tooling.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/shot.py

@@ -0,0 +1,55 @@
+"""Headless-Chromium screenshot helper for the dev UI.
+
+Logs in once via the API, injects the token into localStorage the same way
+the auth store does, then screenshots each path passed on the command line.
+
+  venv/bin/python tools/shot.py /printers/1 /reports/toner /printers/1/edit
+
+Images land in the scratchpad dir as shot_<sanitised-path>.png.
+"""
+
+import sys
+import json
+import urllib.request
+
+from playwright.sync_api import sync_playwright
+
+UI = "http://localhost:5173"
+API = "http://localhost:5001/api"
+USERNAME = "270015376"
+PASSWORD = "changeme"
+OUTDIR = "/tmp/claude-1000/-home-camp-projects/effc3424-ed5e-4b09-b83e-d141bee23c42/scratchpad"
+
+
+def login():
+    body = json.dumps({"username": USERNAME, "password": PASSWORD}).encode()
+    loginrequest = urllib.request.Request(f"{API}/auth/login", data=body,
+                                          headers={"Content-Type": "application/json"})
+    data = json.load(urllib.request.urlopen(loginrequest))["data"]
+    return data["access_token"], data["refresh_token"], data["user"]
+
+
+def main(paths):
+    token, refresh, user = login()
+    seed = f"""
+      localStorage.setItem('token', {json.dumps(token)});
+      localStorage.setItem('refreshToken', {json.dumps(refresh)});
+      localStorage.setItem('user', {json.dumps(json.dumps(user))});
+    """
+    with sync_playwright() as p:
+        browser = p.chromium.launch()
+        context = browser.new_context(viewport={"width": 1400, "height": 1000})
+        context.add_init_script(seed)
+        page = context.new_page()
+        for path in paths:
+            page.goto(f"{UI}{path}", wait_until="networkidle", timeout=30000)
+            page.wait_for_timeout(1200)  # let supply fetch + render settle
+            name = "shot_" + (path.strip("/").replace("/", "_") or "home") + ".png"
+            out = f"{OUTDIR}/{name}"
+            page.screenshot(path=out, full_page=True)
+            print(out)
+        browser.close()
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:] or ["/printers/1"])