FEAT-DEEPSLEEP: Display-Refresh-Timer + CPU-Throttle + Admin Power-Tab

DeepSleep-Modus fuer das ePaper-Display:
- dashboard.py: _is_deepsleep(), _next_wake(), _seconds_until_wake(),
                _apply_cpu_throttle() (Pi auf 600MHz im Sleep)
- 60s sleep-chunks in main loop statt festes Intervall
- render_full() mit deepsleep_active + next_wake params
- ZZZ-Indikator + CPU-Throttle-Badge wenn schlafend
- load_config() auto-filled 'power' defaults aus POWER_DEFAULTS

Admin UI (templates/power.html + admin.py):
- /power (GET+POST): DeepSleep-Toggle, Wake-Times, CPU-Throttle-Settings
- /api/power (JSON): live status polling fuer Sidebar-Badge
- /api/wake (POST): manuelles Display-Aufwecken aus dem Admin
- templates/index.html: Energie-Sidebar-Link + Live-Status-Badge
  (Zz / wach / an / aus) via refreshPowerStatus()

admin.py

@@ -690,6 +690,124 @@ def api_net_forget():
     return jsonify({"ok": rc == 0, "message": out or err})
 
 
+# ============================================================================
+# Power / DeepSleep — Energie-Tab
+# ============================================================================
+@app.route("/power", methods=["GET", "POST"])
+def power_settings():
+    """Energie-Tab: DeepSleep-Konfiguration + manuelle Wake-Aktion."""
+    a = require_auth()
+    if a: return a
+    cfg = dashboard_mod.load_config()
+    power = cfg.get("power", {})
+
+    if request.method == "POST":
+        # Form: deepsleep_enabled, deepsleep_start, deepsleep_end, cpu_throttle
+        power["deepsleep_enabled"] = (request.form.get("deepsleep_enabled") == "on")
+        start = request.form.get("deepsleep_start", "23:30").strip()
+        end = request.form.get("deepsleep_end", "06:30").strip()
+        # Validierung HH:MM
+        import re
+        if re.match(r"^\d{1,2}:\d{2}$", start):
+            power["deepsleep_start"] = start
+        if re.match(r"^\d{1,2}:\d{2}$", end):
+            power["deepsleep_end"] = end
+        power["cpu_throttle"] = (request.form.get("cpu_throttle") == "on")
+        power["wifi_off"] = (request.form.get("wifi_off") == "on")
+        cfg["power"] = power
+        dashboard_mod.save_config(cfg)
+        return redirect(url_for("power_settings"))
+
+    # Status: gerade im DeepSleep?
+    from datetime import datetime
+    now = datetime.now()
+    is_sleep = False
+    next_wake = None
+    if power.get("deepsleep_enabled", False):
+        try:
+            def _to_min(s):
+                h, m = s.split(":")
+                return int(h) * 60 + int(m)
+            now_min = now.hour * 60 + now.minute
+            s = _to_min(power.get("deepsleep_start", "23:00"))
+            e = _to_min(power.get("deepsleep_end", "06:00"))
+            if s < e:
+                is_sleep = s <= now_min < e
+            else:
+                is_sleep = now_min >= s or now_min < e
+            if is_sleep:
+                from datetime import timedelta
+                end_dt = now.replace(hour=e // 60, minute=e % 60, second=0, microsecond=0)
+                if end_dt <= now:
+                    end_dt += timedelta(days=1)
+                next_wake = end_dt
+        except Exception:
+            pass
+
+    return render_template("power.html",
+                           power=power,
+                           is_deepsleep=is_sleep,
+                           next_wake=next_wake.strftime("%H:%M") if next_wake else None,
+                           now=now.strftime("%H:%M"))
+
+
+@app.route("/api/power", methods=["GET"])
+def api_power():
+    """JSON-Status fuer Live-Anzeige in der UI."""
+    a = require_auth()
+    if a: return a
+    cfg = dashboard_mod.load_config()
+    power = cfg.get("power", {})
+    from datetime import datetime, timedelta
+    now = datetime.now()
+    is_sleep = False
+    next_wake = None
+    if power.get("deepsleep_enabled", False):
+        try:
+            def _to_min(s):
+                h, m = s.split(":")
+                return int(h) * 60 + int(m)
+            now_min = now.hour * 60 + now.minute
+            s = _to_min(power.get("deepsleep_start", "23:00"))
+            e = _to_min(power.get("deepsleep_end", "06:00"))
+            if s < e:
+                is_sleep = s <= now_min < e
+            else:
+                is_sleep = now_min >= s or now_min < e
+            if is_sleep:
+                end_dt = now.replace(hour=e // 60, minute=e % 60, second=0, microsecond=0)
+                if end_dt <= now:
+                    end_dt += timedelta(days=1)
+                next_wake = end_dt.strftime("%H:%M")
+                secs_left = int((end_dt - now).total_seconds())
+            else:
+                secs_left = 0
+        except Exception:
+            secs_left = 0
+    else:
+        secs_left = 0
+    return jsonify({
+        "deepsleep_enabled": power.get("deepsleep_enabled", False),
+        "deepsleep_start": power.get("deepsleep_start", "23:30"),
+        "deepsleep_end": power.get("deepsleep_end", "06:30"),
+        "cpu_throttle": power.get("cpu_throttle", True),
+        "is_deepsleep": is_sleep,
+        "next_wake": next_wake,
+        "seconds_until_wake": secs_left,
+        "now": now.strftime("%H:%M"),
+    })
+
+
+@app.route("/api/wake", methods=["POST"])
+def api_wake():
+    """Forciert Aufwachen aus dem DeepSleep (einmaliger Refresh-Trigger)."""
+    a = require_auth()
+    if a: return a
+    # IPC 'refresh' ans Dashboard schicken — der Trigger weckt aus DeepSleep
+    rc = dashboard_mod.send_ipc("refresh")
+    return jsonify({"ok": True, "message": "wake trigger sent", "ipc_result": rc})
+
+
 def main():
     # Wenn direkt ausgeführt: eigenen Renderer starten ist Sache des Run-Skripts.
     # Wir nehmen einfach Port 8080.