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/import-direct.sh

@@ -0,0 +1,77 @@
+#!/bin/sh
+# Direct SQLite Import - Pure Shell, FAST batch mode!
+# Imports MongoDB Extended JSON directly into PocketBase SQLite
+#
+# Usage:
+#   docker cp import-direct.sh pocketbase:/tmp/
+#   docker cp data.json pocketbase:/tmp/
+#   docker exec -it pocketbase sh -c "cd /tmp && chmod +x import-direct.sh && ./import-direct.sh"
+
+set -e
+
+JSON_FILE="${1:-/tmp/data.json}"
+TABLE="${2:-telemetry}"
+REPO="${3:-Proxmox VE}"
+DB="${4:-/app/pb_data/data.db}"
+BATCH=5000
+
+echo "========================================================="
+echo "     Direct SQLite Import (Batch Mode)"
+echo "========================================================="
+echo "JSON:  $JSON_FILE"
+echo "Table: $TABLE"
+echo "Repo:  $REPO"
+echo "Batch: $BATCH"
+echo "---------------------------------------------------------"
+
+# Install jq if missing
+command -v jq >/dev/null || apk add --no-cache jq
+
+# Optimize SQLite for bulk
+sqlite3 "$DB" "PRAGMA journal_mode=WAL; PRAGMA synchronous=OFF; PRAGMA cache_size=100000;"
+
+SQL_FILE="/tmp/batch.sql"
+echo "[INFO] Converting JSON to SQL..."
+START=$(date +%s)
+
+# Convert entire JSON to SQL file (much faster than line-by-line sqlite3 calls)
+{
+    echo "BEGIN TRANSACTION;"
+    jq -r '.[] | @json' "$JSON_FILE" | while read -r r; do
+        CT=$(echo "$r" | jq -r 'if .ct_type|type=="object" then .ct_type["$numberLong"] else .ct_type end // 0')
+        DISK=$(echo "$r" | jq -r 'if .disk_size|type=="object" then .disk_size["$numberLong"] else .disk_size end // 0')
+        CORE=$(echo "$r" | jq -r 'if .core_count|type=="object" then .core_count["$numberLong"] else .core_count end // 0')
+        RAM=$(echo "$r" | jq -r 'if .ram_size|type=="object" then .ram_size["$numberLong"] else .ram_size end // 0')
+        OS=$(echo "$r" | jq -r '.os_type // ""' | sed "s/'/''/g")
+        OSVER=$(echo "$r" | jq -r '.os_version // ""' | sed "s/'/''/g")
+        DIS6=$(echo "$r" | jq -r '.disable_ip6 // "no"' | sed "s/'/''/g")
+        APP=$(echo "$r" | jq -r '.nsapp // "unknown"' | sed "s/'/''/g")
+        METH=$(echo "$r" | jq -r '.method // ""' | sed "s/'/''/g")
+        PVE=$(echo "$r" | jq -r '.pveversion // ""' | sed "s/'/''/g")
+        STAT=$(echo "$r" | jq -r '.status // "unknown"')
+        [ "$STAT" = "done" ] && STAT="success"
+        RID=$(echo "$r" | jq -r '.random_id // ""' | sed "s/'/''/g")
+        TYPE=$(echo "$r" | jq -r '.type // "lxc"' | sed "s/'/''/g")
+        ERR=$(echo "$r" | jq -r '.error // ""' | sed "s/'/''/g")
+        DATE=$(echo "$r" | jq -r 'if .created_at|type=="object" then .created_at["$date"] else .created_at end // ""')
+        ID=$(head -c 100 /dev/urandom | tr -dc 'a-z0-9' | head -c 15)
+        REPO_ESC=$(echo "$REPO" | sed "s/'/''/g")
+
+        echo "INSERT OR IGNORE INTO $TABLE (id,created,updated,ct_type,disk_size,core_count,ram_size,os_type,os_version,disableip6,nsapp,method,pve_version,status,random_id,type,error,repo_source) VALUES ('$ID','$DATE','$DATE',$CT,$DISK,$CORE,$RAM,'$OS','$OSVER','$DIS6','$APP','$METH','$PVE','$STAT','$RID','$TYPE','$ERR','$REPO_ESC');"
+    done
+    echo "COMMIT;"
+} > "$SQL_FILE"
+
+MID=$(date +%s)
+echo "[INFO] SQL generated in $((MID - START))s"
+echo "[INFO] Importing into SQLite..."
+
+sqlite3 "$DB" < "$SQL_FILE"
+
+END=$(date +%s)
+COUNT=$(wc -l < "$SQL_FILE")
+rm -f "$SQL_FILE"
+
+echo "========================================================="
+echo "Done! ~$((COUNT - 2)) records in $((END - START)) seconds"
+echo "========================================================="