Initial commit: Maskan CRM backend

Independent FastAPI backend for Maskan CRM.

Owns contacts, organizations, leads, pipelines, activities, products,
quotes, users, permissions, audit records and first-party integration
credentials, with Alembic migrations against PostgreSQL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/run-python.cjs

@@ -0,0 +1,57 @@
+const { existsSync } = require("node:fs");
+const { join, resolve } = require("node:path");
+const { spawnSync } = require("node:child_process");
+
+const root = resolve(__dirname, "..");
+
+function canRun(command) {
+  const result = spawnSync(command, ["--version"], {
+    cwd: root,
+    shell: false,
+    stdio: "ignore",
+  });
+
+  return result.status === 0;
+}
+
+const configured = process.env.MASKAN_CRM_PYTHON;
+const localCandidates =
+  process.platform === "win32"
+    ? [
+        join(root, ".venv", "Scripts", "python.exe"),
+        join(root, "..", ".venv311", "Scripts", "python.exe"),
+      ]
+    : [
+        join(root, ".venv", "bin", "python"),
+        join(root, "..", ".venv311", "bin", "python"),
+      ];
+
+const candidates = [
+  configured,
+  ...localCandidates.filter(existsSync),
+  process.platform === "win32" ? "python" : "python3",
+  "python",
+].filter(Boolean);
+
+const python = candidates.find(canRun);
+
+if (!python) {
+  console.error(
+    "Python was not found. Create .venv or set MASKAN_CRM_PYTHON.",
+  );
+  process.exit(1);
+}
+
+const result = spawnSync(python, process.argv.slice(2), {
+  cwd: root,
+  env: process.env,
+  shell: false,
+  stdio: "inherit",
+});
+
+if (result.error) {
+  console.error(result.error.message);
+  process.exit(1);
+}
+
+process.exit(result.status ?? 1);