feat: aggiungi container Docker dev e build per Flutter

docker/build/: build headless APK Android
- Dockerfile: Ubuntu 22.04 + Java 17 + Flutter stable + Android SDK
- build.sh: genera android/ automaticamente se mancante, poi
  flutter build apk; --release aggiunge zipalign + apksigner

docker/dev/: ambiente di sviluppo web con hot reload
- Dockerfile: Ubuntu 22.04 + Flutter stable (solo web, senza Android SDK)
- docker-compose.yml: espone porta 5173, monta il progetto come volume
- entrypoint.sh: inizializza web/ se mancante, flutter pub get,
  flutter run -d web-server su 0.0.0.0:5173

docker/README.md: documentazione aggiornata per entrambi i container;
rimossi Dockerfile e build.sh Vue/Capacitor non più usati.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/build.sh

@@ -1,87 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
-DIST_DIR="$PROJECT_ROOT/dist"
-
-FROM_HEAD=false
-RELEASE=false
-for arg in "$@"; do
-  [[ "$arg" == "--head"    ]] && FROM_HEAD=true
-  [[ "$arg" == "--release" ]] && RELEASE=true
-done
-
-# ── Keystore (solo in modalità release) ───────────────────────────────────────
-KEYSTORE_PATH="${KEYSTORE_PATH:-$SCRIPT_DIR/biteplan.jks}"
-
-if $RELEASE; then
-  if [[ ! -f "$KEYSTORE_PATH" ]]; then
-    echo "Errore: keystore non trovato in $KEYSTORE_PATH"
-    echo "Generalo con:"
-    echo "  keytool -genkey -v -keystore docker/biteplan.jks -alias biteplan -keyalg RSA -keysize 2048 -validity 10000"
-    exit 1
-  fi
-
-  if [[ -z "${KEYSTORE_PASS:-}" ]]; then
-    read -rsp "Password keystore: " KEYSTORE_PASS; echo
-  fi
-  if [[ -z "${KEY_PASS:-}" ]]; then
-    read -rsp "Password chiave:   " KEY_PASS; echo
-  fi
-fi
-
-# ── Build Vite ────────────────────────────────────────────────────────────────
-if $FROM_HEAD; then
-  COMMIT_SHA=$(git -C "$PROJECT_ROOT" rev-parse --short HEAD)
-  echo "==> Build Vite da HEAD ($COMMIT_SHA)..."
-  TMPDIR=$(mktemp -d)
-  trap 'rm -rf "$TMPDIR"' EXIT
-  git -C "$PROJECT_ROOT" archive HEAD | tar -x -C "$TMPDIR"
-  cd "$TMPDIR"
-  npm ci --silent
-  npm run build --silent
-  DIST_DIR="$TMPDIR/dist"
-  cd "$PROJECT_ROOT"
-else
-  echo "==> Build Vite dalla working directory..."
-  cd "$PROJECT_ROOT"
-  npm ci --silent
-  npm run build --silent
-fi
-
-# ── Build immagine Docker ─────────────────────────────────────────────────────
-echo "==> Build immagine Docker..."
-docker build \
-    -f "$SCRIPT_DIR/Dockerfile" \
-    -t biteplan-builder \
-    "$PROJECT_ROOT"
-
-# ── Generazione APK ───────────────────────────────────────────────────────────
-echo "==> Generazione APK${RELEASE:+ release}..."
-mkdir -p "$PROJECT_ROOT/dist"
-
-DOCKER_ARGS=(
-  --rm
-  -v "$DIST_DIR:/app/dist"
-)
-
-if $RELEASE; then
-  DOCKER_ARGS+=(
-    -e BUILD_TYPE=release
-    -e KEYSTORE_PASS="$KEYSTORE_PASS"
-    -e KEY_PASS="$KEY_PASS"
-    -v "$KEYSTORE_PATH:/app/biteplan.jks:ro"
-  )
-fi
-
-docker run "${DOCKER_ARGS[@]}" biteplan-builder
-
-# Con --head l'APK è nella dir temporanea — copiarlo in dist/ del progetto
-if $FROM_HEAD; then
-  mkdir -p "$PROJECT_ROOT/dist"
-  cp "$DIST_DIR/biteplan.apk" "$PROJECT_ROOT/dist/biteplan.apk"
-fi
-
-echo ""
-echo "APK pronto in: $PROJECT_ROOT/dist/biteplan.apk"