feat(deploy): despliegue nativo Debian sin Docker

- Elimina todos los Dockerfiles y docker-compose.yml
- Elimina scripts Docker (start_docker, reset_and_deploy, deploy-clean)
- Agrega deploy/debian/ con despliegue nativo via systemd:
  - install.sh: instalacion completa en Debian (PostgreSQL, Redis,
    Qdrant binario, Go, Python venv, nginx, frontend compilado)
  - build.sh: recompila binarios Go y frontend sin reinstalar
  - env.example: variables de entorno sin referencias Docker
  - nginx.conf: sirve React estatico + proxy al API Go en localhost
  - systemd/*.service: 16 servicios (8 Go + 7 Python + Qdrant)

Todos los hostnames Docker (db, redis, qdrant) reemplazados por 127.0.0.1

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

deploy/debian/build.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+# =============================================================================
+# RSS2 - Recompila binarios y frontend (sin reinstalar el sistema)
+# Usar despues de actualizar el codigo: bash build.sh
+# =============================================================================
+set -euo pipefail
+
+RSS2_HOME="/opt/rss2"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+export PATH=$PATH:/usr/local/go/bin
+
+GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
+info() { echo -e "${GREEN}[BUILD]${NC} $*"; }
+warn() { echo -e "${YELLOW}[WARN]${NC} $*"; }
+
+# --- Go Backend + Workers ---
+if [[ -d "$REPO_ROOT/backend" ]]; then
+    info "Compilando backend Go..."
+    (cd "$REPO_ROOT/backend" && \
+     CGO_ENABLED=0 GOOS=linux go build -buildvcs=false -o "$RSS2_HOME/bin/server" ./cmd/server)
+    info "  [OK] server"
+
+    for cmd in scraper discovery wiki_worker topics related qdrant; do
+        [[ -d "$REPO_ROOT/backend/cmd/$cmd" ]] || continue
+        (cd "$REPO_ROOT/backend" && \
+         CGO_ENABLED=0 GOOS=linux go build -buildvcs=false -o "$RSS2_HOME/bin/$cmd" "./cmd/$cmd")
+        info "  [OK] $cmd"
+    done
+fi
+
+# --- Ingestor Go ---
+if [[ -d "$REPO_ROOT/rss-ingestor-go" ]]; then
+    info "Compilando ingestor Go..."
+    (cd "$REPO_ROOT/rss-ingestor-go" && \
+     CGO_ENABLED=0 GOOS=linux go build -buildvcs=false -o "$RSS2_HOME/bin/ingestor" .)
+    info "  [OK] ingestor"
+fi
+
+# --- Frontend React ---
+if [[ -d "$REPO_ROOT/frontend" ]]; then
+    info "Compilando frontend React..."
+    (cd "$REPO_ROOT/frontend" && \
+     npm install --silent && \
+     VITE_API_URL=/api npm run build -- --outDir "$RSS2_HOME/frontend/dist")
+    info "  [OK] frontend"
+fi
+
+# --- Workers Python ---
+info "Sincronizando workers Python..."
+rsync -a --delete "$REPO_ROOT/workers/" "$RSS2_HOME/src/workers/"
+cp "$REPO_ROOT/entity_config.json" "$RSS2_HOME/src/" 2>/dev/null || true
+info "  [OK] workers Python"
+
+chown -R rss2:rss2 "$RSS2_HOME/bin" "$RSS2_HOME/frontend/dist" "$RSS2_HOME/src"
+
+# --- Restart servicios ---
+info "Reiniciando servicios..."
+GO_SERVICES=(rss2-backend rss2-ingestor rss2-scraper rss2-discovery rss2-wiki rss2-topics rss2-related rss2-qdrant-worker)
+PY_SERVICES=(rss2-langdetect rss2-translation-scheduler rss2-translator rss2-embeddings rss2-ner rss2-cluster rss2-categorizer)
+
+for svc in "${GO_SERVICES[@]}" "${PY_SERVICES[@]}"; do
+    systemctl is-active --quiet "$svc" && systemctl restart "$svc" && info "  restarted $svc" || true
+done
+
+systemctl reload nginx 2>/dev/null || true
+
+info "Build completado."