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/fix-timestamps.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+# Post-migration script to fix timestamps in PocketBase
+# Run this INSIDE the PocketBase container after migration completes
+#
+# Usage: ./fix-timestamps.sh
+
+set -e
+
+DB_PATH="/app/pb_data/data.db"
+
+echo "==========================================================="
+echo "   Fix Timestamps in PocketBase"
+echo "==========================================================="
+echo ""
+
+# Check if sqlite3 is available
+if ! command -v sqlite3 &> /dev/null; then
+    echo "sqlite3 not found. Installing..."
+    apk add sqlite 2>/dev/null || apt-get update && apt-get install -y sqlite3
+fi
+
+# Check if database exists
+if [ ! -f "$DB_PATH" ]; then
+    echo "Database not found at $DB_PATH"
+    echo "Trying alternative paths..."
+    
+    if [ -f "/pb_data/data.db" ]; then
+        DB_PATH="/pb_data/data.db"
+    elif [ -f "/pb/pb_data/data.db" ]; then
+        DB_PATH="/pb/pb_data/data.db"
+    else
+        DB_PATH=$(find / -name "data.db" 2>/dev/null | head -1)
+    fi
+    
+    if [ -z "$DB_PATH" ] || [ ! -f "$DB_PATH" ]; then
+        echo "Could not find PocketBase database!"
+        exit 1
+    fi
+fi
+
+echo "Database: $DB_PATH"
+echo ""
+
+# List tables
+echo "Tables in database:"
+sqlite3 "$DB_PATH" ".tables"
+echo ""
+
+# Find the telemetry table (usually matches collection name)
+echo "Looking for telemetry/installations table..."
+TABLE_NAME=$(sqlite3 "$DB_PATH" ".tables" | tr ' ' '\n' | grep -E "telemetry|installations" | head -1)
+
+if [ -z "$TABLE_NAME" ]; then
+    echo "Could not auto-detect table. Available tables:"
+    sqlite3 "$DB_PATH" ".tables"
+    echo ""
+    read -p "Enter table name: " TABLE_NAME
+fi
+
+echo "Using table: $TABLE_NAME"
+echo ""
+
+# Check if old_created column exists
+HAS_OLD_CREATED=$(sqlite3 "$DB_PATH" "PRAGMA table_info($TABLE_NAME);" | grep -c "old_created" || echo "0")
+
+if [ "$HAS_OLD_CREATED" -eq "0" ]; then
+    echo "Column 'old_created' not found in table $TABLE_NAME"
+    echo "Migration may not have been run with timestamp preservation."
+    exit 1
+fi
+
+# Show sample data before update
+echo "Sample data BEFORE update:"
+sqlite3 "$DB_PATH" "SELECT id, created, old_created FROM $TABLE_NAME WHERE old_created IS NOT NULL AND old_created != '' LIMIT 3;"
+echo ""
+
+# Count records to update
+COUNT=$(sqlite3 "$DB_PATH" "SELECT COUNT(*) FROM $TABLE_NAME WHERE old_created IS NOT NULL AND old_created != '';")
+echo "Records to update: $COUNT"
+echo ""
+
+read -p "Proceed with timestamp update? [y/N] " -n 1 -r
+echo ""
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+    echo "Aborted."
+    exit 0
+fi
+
+# Perform the update
+echo "Updating timestamps..."
+sqlite3 "$DB_PATH" "UPDATE $TABLE_NAME SET created = old_created, updated = old_created WHERE old_created IS NOT NULL AND old_created != '';"
+
+# Show sample data after update
+echo ""
+echo "Sample data AFTER update:"
+sqlite3 "$DB_PATH" "SELECT id, created, old_created FROM $TABLE_NAME LIMIT 3;"
+echo ""
+
+echo "==========================================================="
+echo "   Timestamp Update Complete!"
+echo "==========================================================="
+echo ""
+echo "Next steps:"
+echo "1. Verify data in PocketBase Admin UI"
+echo "2. Remove the 'old_created' field from the collection schema"
+echo ""