chore(dev): add HACS installation and sync scripts for testing

Added scripts to install HACS in DevContainer for testing the
integration alongside other HACS components.

Changes:
- scripts/setup: Automatically install HACS and create symlink
- scripts/sync-hacs: Sync HACS-installed integrations via symlinks
- .gitignore: Ignore custom_components/* except tibber_prices

HACS installs to config/custom_components/, symlinks in
custom_components/ make integrations visible to Home Assistant.

Impact: Developers can test with other integrations. No user changes.

.gitignore

@@ -19,6 +19,11 @@ uv.lock
 config/*
 !config/configuration.yaml
 
+# HACS and other custom components installed for testing
+# Ignore everything in custom_components/ except tibber_prices
+custom_components/*
+!custom_components/tibber_prices/
+
 # Home Assistant database and logs
 *.db
 *.db-shm

scripts/setup

@@ -25,4 +25,61 @@ fi
 
 scripts/bootstrap
 
+# Install HACS for testing with other custom components
+echo ""
+echo "==> Installing HACS in dev environment..."
+echo "    This allows testing your integration alongside other HACS components."
+
+# Ensure config directory is initialized by Home Assistant first
+if [ ! -f "config/.HA_VERSION" ]; then
+    echo "    → Initializing Home Assistant config directory..."
+    hass --config "${PWD}/config" --script ensure_config >/dev/null 2>&1 || true
+fi
+
+# Create custom_components directory if it doesn't exist
+mkdir -p config/custom_components
+
+# Clean up existing HACS installation if present
+if [ -d "config/custom_components/hacs" ]; then
+    echo "    → Removing existing HACS installation..."
+    rm -rf config/custom_components/hacs
+fi
+if [ -L "custom_components/hacs" ]; then
+    echo "    → Removing existing HACS symlink..."
+    rm -f custom_components/hacs
+fi
+
+# Download and extract HACS (stable release ZIP)
+cd config/custom_components
+echo "    → Downloading HACS..."
+if wget -q https://github.com/hacs/integration/releases/latest/download/hacs.zip && \
+   unzip -q hacs.zip -d hacs && \
+   rm hacs.zip; then
+    cd ../..
+
+    # Install HACS Python dependencies
+    echo "    → Installing HACS Python dependencies..."
+    if uv pip install -q 'aiogithubapi>=22.10.1'; then
+        # Create symlink so HA finds HACS alongside tibber_prices
+        echo "    → Creating symlink in custom_components/..."
+        ln -sf "${PWD}/config/custom_components/hacs" custom_components/hacs
+
+        echo "    ✓ HACS installed successfully in config/custom_components/hacs/"
+        echo "    ℹ️  HACS is installed as stable release (no auto-updates)"
+        echo "    ℹ️  HACS will install other integrations in config/custom_components/"
+        echo "    ℹ️  Run './scripts/sync-hacs' after installing integrations via HACS"
+    else
+        echo "    ⚠️  Warning: Failed to install HACS Python dependencies"
+        echo "    ℹ️  You can install manually: uv pip install 'aiogithubapi>=22.10.1'"
+    fi
+else
+    echo "    ⚠️  Warning: HACS installation failed"
+    echo "    ℹ️  You can install manually:"
+    echo "        cd config/custom_components"
+    echo "        wget https://github.com/hacs/integration/releases/latest/download/hacs.zip"
+    echo "        unzip hacs.zip -d hacs && rm hacs.zip"
+    cd ../..
+fi
+
+echo ""
 echo "==> Project is now ready to go!"

scripts/sync-hacs

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+# script/sync-hacs: Sync HACS-installed integrations to custom_components/
+
+set -e
+
+cd "$(dirname "$0")/.."
+
+echo "==> Syncing HACS-installed integrations..."
+
+# Check if config/custom_components exists
+if [ ! -d "config/custom_components" ]; then
+    echo "    ℹ️  No config/custom_components directory found"
+    exit 0
+fi
+
+# Create symlinks for all integrations in config/custom_components/
+# except those that already exist in custom_components/
+synced=0
+for dir in config/custom_components/*/; do
+    component=$(basename "$dir")
+    target="custom_components/$component"
+
+    # Skip if already exists and is not a symlink (don't touch tibber_prices)
+    if [ -e "$target" ] && [ ! -L "$target" ]; then
+        continue
+    fi
+
+    # Create or update symlink
+    ln -sf "${PWD}/config/custom_components/$component" "$target"
+    echo "    ✓ Linked: $component"
+    synced=$((synced + 1))
+done
+
+if [ $synced -eq 0 ]; then
+    echo "    ℹ️  No new integrations to sync"
+else
+    echo "    ✓ Synced $synced integration(s)"
+fi