feat: extract shared infrastructure from shared_lib

Phase 1-3 of decoupling plan:
- Shared DB, models, infrastructure, browser, config, utils
- Event infrastructure (domain_events outbox, bus, processor)
- Structured logging
- Generic container concept (container_type/container_id)
- Alembic migrations for all schema changes

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

editor/build.mjs

@@ -0,0 +1,45 @@
+import * as esbuild from "esbuild";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const isProduction = process.env.NODE_ENV === "production";
+const isWatch = process.argv.includes("--watch");
+
+/** @type {import('esbuild').BuildOptions} */
+const opts = {
+  alias: {
+    "koenig-styles": path.resolve(
+      __dirname,
+      "node_modules/@tryghost/koenig-lexical/dist/index.css"
+    ),
+  },
+  entryPoints: ["src/index.jsx"],
+  bundle: true,
+  outdir: "../static/scripts",
+  entryNames: "editor",
+  format: "iife",
+  target: "es2020",
+  jsx: "automatic",
+  minify: isProduction,
+  define: {
+    "process.env.NODE_ENV": JSON.stringify(
+      isProduction ? "production" : "development"
+    ),
+  },
+  loader: {
+    ".svg": "dataurl",
+    ".woff": "file",
+    ".woff2": "file",
+    ".ttf": "file",
+  },
+  logLevel: "info",
+};
+
+if (isWatch) {
+  const ctx = await esbuild.context(opts);
+  await ctx.watch();
+  console.log("Watching for changes...");
+} else {
+  await esbuild.build(opts);
+}