refactor: replace shell entrypoint with TypeScript, add DB retry logic

- Migrate Docker entrypoint from inline shell script to TypeScript for better maintainability
- Add exponential backoff DB connection retry (prod only, dev fails fast)
- Increase healthcheck start-period to account for DB warmup

web/entrypoint.ts

@@ -0,0 +1,88 @@
+import { spawn, type Subprocess } from "bun";
+import { unlinkSync, existsSync } from "fs";
+
+const BUN_SOCKET = "/tmp/bun.sock";
+const API_SOCKET = "/tmp/api.sock";
+const PORT = process.env.PORT || "8080";
+const LOG_JSON = process.env.LOG_JSON || "true";
+
+function cleanup() {
+  try {
+    unlinkSync(BUN_SOCKET);
+  } catch {}
+  try {
+    unlinkSync(API_SOCKET);
+  } catch {}
+}
+
+// Cleanup on signals
+process.on("SIGTERM", () => {
+  cleanup();
+  process.exit(0);
+});
+process.on("SIGINT", () => {
+  cleanup();
+  process.exit(0);
+});
+
+// Start Bun SSR
+console.log("Starting Bun SSR...");
+const bunProc = spawn({
+  cmd: ["bun", "--preload", "/app/web/console-logger.js", "index.js"],
+  cwd: "/app/web/build",
+  env: {
+    ...process.env,
+    SOCKET_PATH: BUN_SOCKET,
+    LOG_JSON,
+    UPSTREAM_URL: API_SOCKET,
+  },
+  stdout: "inherit",
+  stderr: "inherit",
+});
+
+// Wait for Bun socket (5s timeout)
+const startTime = Date.now();
+while (!existsSync(BUN_SOCKET)) {
+  if (Date.now() - startTime > 5000) {
+    console.error("ERROR: Bun failed to create socket within 5s");
+    bunProc.kill();
+    cleanup();
+    process.exit(1);
+  }
+  await Bun.sleep(100);
+}
+
+// Start Rust server
+console.log("Starting Rust API...");
+const rustProc = spawn({
+  cmd: [
+    "/app/api",
+    "--listen",
+    `[::]:${PORT}`,
+    "--listen",
+    API_SOCKET,
+    "--downstream",
+    BUN_SOCKET,
+  ],
+  stdout: "inherit",
+  stderr: "inherit",
+});
+
+// Monitor both processes - exit if either dies
+async function monitor(name: string, proc: Subprocess) {
+  const exitCode = await proc.exited;
+  console.error(`${name} exited with code ${exitCode}`);
+  return { name, exitCode };
+}
+
+const result = await Promise.race([
+  monitor("Bun", bunProc),
+  monitor("Rust", rustProc),
+]);
+
+// Kill the other process
+console.error(`${result.name} died, shutting down...`);
+bunProc.kill();
+rustProc.kill();
+cleanup();
+process.exit(result.exitCode || 1);