Reorganize repo: one folder per application under apps/.

Move docker/ and configs/ into apps/<name>/ with config/ subfolders.
Proxmox split into hosts/pve and hosts/dell-proxmox. Nginx under
infrastructure/. Update sync script, RESTORE.md, and per-app READMEs.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/home-assistant/README.md

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+# Home Assistant
+
+Config-only — HA draait op `192.168.1.235:8123`.
+
+| | |
+|---|---|
+| **Git** | `config/*.yaml` |
+| **NAS backup** | `/volume1/docker/Configs/HA/config` |
+
+Sync: `sh scripts/sync-from-nas.sh`

apps/home-assistant/config/automations.yaml

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+[]

apps/home-assistant/config/configuration.yaml

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+
+# Loads default set of integrations. Do not remove.
+default_config:
+
+# Load frontend themes from the themes folder
+frontend:
+  themes: !include_dir_merge_named themes
+
+automation: !include automations.yaml
+script: !include scripts.yaml
+scene: !include scenes.yaml

apps/home-assistant/config/secrets.yaml

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+
+# Use this file to store secrets like usernames and passwords.
+# Learn more at https://www.home-assistant.io/docs/configuration/secrets/
+some_password: welcome