feat(mcpedia): Phase 1 MVP — monorepo, Core, Web UI, MCP server, Postgres FTS

- bun workspaces + Turborepo monorepo (apps/web, apps/mcp; packages/*, scripts)
- @mcpedia/core single business-logic layer (Document/Content/Search services)
- @mcpedia/db Drizzle schema: documents + weighted tsvector (GIN) for FTS
- @mcpedia/parser frontmatter, @mcpedia/search Postgres FTS (ts_rank+ts_headline)
- Next.js 16 Web UI (home/doc SSG, search dynamic) + react-markdown render
- MCP server (stdio) with 4 tools + in-memory smoke test
- scripts/indexer walks content/ -> upserts into Postgres
- 4 seed docs; README + PHASES status

packages/config/src/index.ts

@@ -0,0 +1,44 @@
+import { fileURLToPath } from "node:url";
+import { dirname, resolve } from "node:path";
+import { existsSync, readFileSync } from "node:fs";
+
+const here = dirname(fileURLToPath(import.meta.url));
+// packages/config -> repo root (../../..)
+export const REPO_ROOT = resolve(here, "../../..");
+
+/**
+ * Load .env (repo root) as the authoritative dev config and apply it to
+ * process.env. We intentionally OVERRIDE any inherited DATABASE_URL so a stray
+ * shell env var can never point the app at the wrong database. .env is
+ * gitignored; for deploy, set the real vars in the environment and omit .env.
+ */
+function loadDotEnv() {
+  const dotEnv = resolve(REPO_ROOT, ".env");
+  if (!existsSync(dotEnv)) return;
+  for (const line of readFileSync(dotEnv, "utf8").split("\n")) {
+    const m = line.match(/^\s*([A-Z0-9_]+)\s*=\s*(.*)\s*$/);
+    if (!m) continue;
+    const key = m[1];
+    let val = m[2];
+    if (
+      (val.startsWith('"') && val.endsWith('"')) ||
+      (val.startsWith("'") && val.endsWith("'"))
+    ) {
+      val = val.slice(1, -1);
+    }
+    process.env[key] = val;
+  }
+}
+loadDotEnv();
+
+export const CONTENT_ROOT =
+  process.env.CONTENT_ROOT ?? resolve(REPO_ROOT, "content");
+
+export const DATABASE_URL = process.env.DATABASE_URL ?? "";
+
+if (!DATABASE_URL) {
+  // Fail fast with an explicit message instead of a cryptic driver error.
+  throw new Error(
+    "DATABASE_URL is not set. Copy .env.example to .env and set it (dev uses imrnes Postgres :6432).",
+  );
+}