feat: migrate app to local Fastify and Postgres stack

Replace Supabase auth and search runtime with a local Fastify API, PostgreSQL/PostGIS schema, and local session handling. Scaffold the worker and deep-research foundations while keeping the existing research, dashboard, and map flows running on the new backend.

db/scripts/migrate.ts

@@ -0,0 +1,54 @@
+import 'dotenv/config';
+import { readdir, readFile } from 'node:fs/promises';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { getDbPool } from '../../server/src/db/pool.js';
+
+const currentDir = path.dirname(fileURLToPath(import.meta.url));
+const migrationsDir = path.resolve(currentDir, '../migrations');
+
+async function run() {
+  const pool = getDbPool();
+  const client = await pool.connect();
+
+  try {
+    await client.query(`
+      create table if not exists public.schema_migrations (
+        id text primary key,
+        applied_at timestamptz not null default now()
+      )
+    `);
+
+    const appliedRows = await client.query<{ id: string }>('select id from public.schema_migrations');
+    const appliedIds = new Set(appliedRows.rows.map((row) => row.id));
+
+    const migrationFiles = (await readdir(migrationsDir))
+      .filter((entry) => entry.endsWith('.sql'))
+      .sort((left, right) => left.localeCompare(right));
+
+    for (const migrationFile of migrationFiles) {
+      if (appliedIds.has(migrationFile)) {
+        continue;
+      }
+
+      const migrationPath = path.join(migrationsDir, migrationFile);
+      const sql = await readFile(migrationPath, 'utf8');
+
+      console.log(`Applying migration ${migrationFile}`);
+      await client.query('begin');
+      await client.query(sql);
+      await client.query('insert into public.schema_migrations (id) values ($1)', [migrationFile]);
+      await client.query('commit');
+    }
+
+    console.log('Migrations complete');
+  } catch (error) {
+    await client.query('rollback');
+    throw error;
+  } finally {
+    client.release();
+    await pool.end();
+  }
+}
+
+await run();