docs: add Heimnetzwerk plan with VLAN and hardware configuration

Documented Heimnetzwerk architecture in `Heim-Netzwerk-Plan_02-2026.md`, including VLAN definitions, hardware setup, and connection details with a visual graph layout.

docs/Heim-Netzwerk-Plan_02-2026.md

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+
+#  Heimnetzwerk
+
+```mermaid
+graph TD
+%% Internet & Modem
+  WAN((Internet A1)) --- ONT[A1 Glasfaser ONT]
+  ONT ---|RJ45 - VLAN 2 / PPPoE| Router[VLAN-Router / Firewall]
+
+  subgraph Keller [Keller: Technik & Server]
+    Router ---|Trunk: Alle VLANs| Switch[Managed 10G Switch]
+
+    subgraph ServerZone [VLAN 20: Apps & Server]
+      Switch ===|10GbE Port 1| MiniPC[Mini-PC Server]
+      Switch ---|10GbE Port 2| MiniPC
+      note1[Dual 10G für Redundanz oder Bonding]
+    end
+  end
+
+  subgraph Etagen [Wohnbereich: EG & DG]
+    Switch ---|Cat-7| AP_EG[Access Point EG]
+    Switch ---|Cat-7| AP_DG[Access Point DG]
+
+    AP_EG -.-> SSID_P((WLAN Privat - VLAN 10))
+    AP_EG -.-> SSID_A((WLAN Apps - VLAN 20))
+  end
+
+%% Definition der VLANs
+  classDef vlan10 fill:#e1f5fe,stroke:#01579b
+  classDef vlan20 fill:#fff3e0,stroke:#e65100
+  class MiniPC,SSID_A vlan20
+  class SSID_P vlan10
+```
+
+
+