Add telemetry data service and dashboard revamp

Introduce a telemetry data microservice under misc/data: add Dockerfile, entrypoint, migration tools, README, LICENSE and a .gitignore. Increase Docker CACHE_TTL_SECONDS to 300s. Implement extensive dashboard and analytics updates in dashboard.go: add total_all_time and sample_size, return total item counts from fetchRecords (with page/limit handling and a maxRecords guard), raise top-N limits, add a minimum-installs threshold for failed-apps, and numerous UI/style/layout improvements in the embedded DashboardHTML. Minor formatting tweak to misc/api.func.

misc/data/migration/migrate-linux.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+# Migration script for Proxmox VE data
+# Run directly on the server machine
+#
+# Usage: ./migrate-linux.sh
+#
+# Prerequisites:
+# - Go installed (apt install golang-go)
+# - Network access to source API and PocketBase
+
+set -e
+
+echo "==========================================================="
+echo "   Proxmox VE Data Migration to PocketBase"
+echo "==========================================================="
+
+# Configuration - EDIT THESE VALUES
+export MIGRATION_SOURCE_URL="https://api.htl-braunau.at/data"
+export POCKETBASE_URL="http://db.community-scripts.org"
+export POCKETBASE_COLLECTION="telemetry"
+export PB_AUTH_COLLECTION="_superusers"
+export PB_IDENTITY="db_admin@community-scripts.org"
+export PB_PASSWORD="YOUR_PASSWORD_HERE"  # <-- CHANGE THIS!
+export REPO_SOURCE="Proxmox VE"
+export DATE_UNTIL="2026-02-10"
+export BATCH_SIZE="500"
+
+# Optional: Resume from specific page
+# export START_PAGE="100"
+
+# Optional: Only import records after this date
+# export DATE_FROM="2020-01-01"
+
+echo ""
+echo "Configuration:"
+echo "  Source:     $MIGRATION_SOURCE_URL"
+echo "  Target:     $POCKETBASE_URL"
+echo "  Collection: $POCKETBASE_COLLECTION"
+echo "  Repo:       $REPO_SOURCE"
+echo "  Until:      $DATE_UNTIL"
+echo "  Batch:      $BATCH_SIZE"
+echo ""
+
+# Check if Go is installed
+if ! command -v go &> /dev/null; then
+    echo "Go is not installed. Installing..."
+    apt-get update && apt-get install -y golang-go
+fi
+
+# Download migrate.go if not present
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+MIGRATE_GO="$SCRIPT_DIR/migrate.go"
+
+if [ ! -f "$MIGRATE_GO" ]; then
+    echo "migrate.go not found in $SCRIPT_DIR"
+    echo "Please copy migrate.go to this directory first."
+    exit 1
+fi
+
+echo "Building migration tool..."
+cd "$SCRIPT_DIR"
+go build -o migrate migrate.go
+
+echo ""
+echo "Starting migration..."
+echo "Press Ctrl+C to stop (you can resume later with START_PAGE)"
+echo ""
+
+./migrate
+
+echo ""
+echo "==========================================================="
+echo "   Post-Migration Steps"
+echo "==========================================================="
+echo ""
+echo "1. Connect to PocketBase container:"
+echo "   docker exec -it <pocketbase-container> sh"
+echo ""
+echo "2. Find the table name:"
+echo "   sqlite3 /app/pb_data/data.db '.tables'"
+echo ""
+echo "3. Update timestamps (replace <table> with actual name):"
+echo "   sqlite3 /app/pb_data/data.db \"UPDATE <table> SET created = old_created, updated = old_created WHERE old_created IS NOT NULL AND old_created != ''\""
+echo ""
+echo "4. Verify timestamps:"
+echo "   sqlite3 /app/pb_data/data.db \"SELECT created, old_created FROM <table> LIMIT 5\""
+echo ""
+echo "5. Remove old_created field in PocketBase Admin UI"
+echo ""