add POST /api/v1/dot/name-check: parallel SOS + FMCSA name availability check

- Checks state SOS for entity name availability (via workers adapter)
- Checks FMCSA census for exact + fuzzy name matches
- Returns: sos_available, fmcsa_in_use, fmcsa_matches, combined 'available' flag
- 20s timeout on SOS lookup, FMCSA query is instant (local DB)

api/src/routes/dot-lookup.ts

@@ -669,6 +669,99 @@ router.get("/api/v1/dot/search", async (req, res) => {
   }
 });
 
+// ── Name Availability Check (SOS + FMCSA parallel) ───────────────
+
+router.post("/api/v1/dot/name-check", async (req, res) => {
+  const { name, state } = req.body ?? {};
+  if (!name || name.length < 2) {
+    res.status(400).json({ error: "name is required (at least 2 characters)." });
+    return;
+  }
+  const stateCode = (state || "").toUpperCase().trim();
+
+  try {
+    // Run SOS check and FMCSA check in parallel
+    const [sosResult, fmcsaResult] = await Promise.allSettled([
+      // 1. SOS name availability via workers /entity-status
+      stateCode && stateCode.length === 2
+        ? fetch(`${WORKER_URL}/entity-status`, {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ entity_name: name, state_code: stateCode }),
+            signal: AbortSignal.timeout(20000),
+          }).then(r => r.json())
+        : Promise.resolve({ skipped: true }),
+
+      // 2. FMCSA census — exact and fuzzy name match
+      pool.query(
+        `SELECT dot_number, legal_name, dba_name, phy_state, carrier_operation
+         FROM fmcsa_carriers
+         WHERE legal_name ILIKE $1 OR dba_name ILIKE $1
+         ORDER BY CASE WHEN UPPER(legal_name) = UPPER($2) THEN 0 ELSE 1 END, legal_name
+         LIMIT 20`,
+        [`%${name}%`, name],
+      ),
+    ]);
+
+    // Parse SOS result
+    let sosAvailable: boolean | null = null;
+    let sosEntity: Record<string, unknown> | null = null;
+    if (sosResult.status === "fulfilled") {
+      const sos = sosResult.value as Record<string, unknown>;
+      if (sos.skipped) {
+        sosAvailable = null; // No state provided
+      } else if (sos.found) {
+        sosAvailable = false; // Name is taken
+        sosEntity = sos as Record<string, unknown>;
+      } else {
+        sosAvailable = true; // Name is available
+      }
+    }
+
+    // Parse FMCSA result
+    let fmcsaMatches: Record<string, unknown>[] = [];
+    let fmcsaExactMatch = false;
+    if (fmcsaResult.status === "fulfilled") {
+      fmcsaMatches = fmcsaResult.value.rows || [];
+      fmcsaExactMatch = fmcsaMatches.some(
+        (r: Record<string, unknown>) =>
+          (r.legal_name as string || "").toUpperCase() === name.toUpperCase(),
+      );
+    }
+
+    res.json({
+      name,
+      state: stateCode || null,
+      sos_available: sosAvailable,
+      sos_entity: sosEntity ? {
+        status: sosEntity.status,
+        entity_number: sosEntity.entity_number,
+        entity_type: sosEntity.entity_type,
+      } : null,
+      fmcsa_in_use: fmcsaExactMatch,
+      fmcsa_matches: fmcsaMatches.slice(0, 10).map((r: Record<string, unknown>) => ({
+        dot_number: r.dot_number,
+        legal_name: r.legal_name,
+        dba_name: r.dba_name,
+        state: r.phy_state,
+      })),
+      available: sosAvailable !== false && !fmcsaExactMatch,
+      message: fmcsaExactMatch
+        ? `"${name}" is already registered with FMCSA (DOT# ${(fmcsaMatches.find((r: Record<string, unknown>) => (r.legal_name as string || "").toUpperCase() === name.toUpperCase()) as Record<string, unknown>)?.dot_number}). Choose a different name or use your existing entity.`
+        : sosAvailable === false
+        ? `"${name}" is already registered in ${stateCode}. The name may still be usable if it's your entity.`
+        : sosAvailable === true
+        ? `"${name}" is available in ${stateCode} and not found in FMCSA records.`
+        : !stateCode
+        ? `"${name}" ${fmcsaExactMatch ? "is" : "is not"} found in FMCSA records. Provide a state to also check Secretary of State availability.`
+        : `Could not verify availability. Check with the ${stateCode} Secretary of State directly.`,
+    });
+  } catch (err) {
+    console.error("[name-check] Error:", err);
+    res.status(500).json({ error: "Name check failed." });
+  }
+});
+
 // ── State Requirements Lookup ──────────────────────────────────────
 
 router.get("/api/v1/dot/state-requirements", async (req, res) => {