Initial scaffold: backend base + docker-compose dev infra + sveltekit frontend

backend/migrations/000001_init.down.sql

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+DROP TABLE IF EXISTS audit_log;
+DROP TABLE IF EXISTS services;
+DROP TABLE IF EXISTS hosts;

backend/migrations/000001_init.up.sql

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+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE hosts (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name            TEXT NOT NULL UNIQUE,
+    connection_type TEXT NOT NULL DEFAULT 'local' CHECK (connection_type IN ('local', 'agent', 'tcp')),
+    endpoint_url    TEXT,
+    agent_token_hash TEXT,
+    status          TEXT NOT NULL DEFAULT 'unknown' CHECK (status IN ('unknown', 'online', 'offline')),
+    last_seen_at    TIMESTAMPTZ,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE services (
+    id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    host_id             UUID NOT NULL REFERENCES hosts(id) ON DELETE CASCADE,
+    display_name        TEXT NOT NULL,
+    container_name_or_id TEXT NOT NULL,
+    compose_project     TEXT,
+    tags                TEXT[] NOT NULL DEFAULT '{}',
+    created_at          TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (host_id, container_name_or_id)
+);
+
+CREATE TABLE audit_log (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_sub    TEXT NOT NULL,
+    action      TEXT NOT NULL,
+    target_type TEXT NOT NULL,
+    target_id   TEXT NOT NULL,
+    host_id     UUID REFERENCES hosts(id) ON DELETE SET NULL,
+    metadata    JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_services_host_id ON services(host_id);
+CREATE INDEX idx_audit_log_created_at ON audit_log(created_at DESC);
+CREATE INDEX idx_audit_log_user_sub ON audit_log(user_sub);
+
+-- Host único de la Fase 1: el mismo servidor donde corre el backend.
+INSERT INTO hosts (name, connection_type) VALUES ('local', 'local');