refactor: add configurable Nominatim adapter and portable source helpers

server/providers/overpass/query.js

@@ -1,3 +1,4 @@
+import { stripOverpassNoise } from '../../../src/sources/overpass.js';
 import {
   OVERPASS_MAX_AROUND_M,
   OVERPASS_MAX_BBOX_DEG,
@@ -31,54 +32,6 @@ function isOverpassBoundaryQuery(cacheKey) {
  *
  * @returns {{ok:true, body:string} | {ok:false, error:string}}
  */
-/**
- * Single-pass lexer: blank out quoted literals (→ empty quotes) and strip line
- * and block comments — recognizing each in one walk so a comment marker INSIDE a
- * quoted string is treated as string content, not a comment (and vice versa).
- * Chained regex replaces get the ordering wrong (a quoted slash-slash would hide
- * the rest of the line), which is exactly the bypass this avoids.
- */
-function stripOverpassNoise(src) {
-  let out = '';
-  let i = 0;
-  const n = src.length;
-  while (i < n) {
-    const c = src[i];
-    if (c === '"' || c === "'") {
-      const quote = c;
-      i += 1;
-      while (i < n) {
-        if (src[i] === '\\') {
-          i += 2;
-          continue;
-        } // escaped char
-        if (src[i] === quote) {
-          i += 1;
-          break;
-        } // closing quote
-        i += 1;
-      }
-      out += quote + quote; // collapse the literal to empty quotes
-      continue;
-    }
-    if (c === '/' && src[i + 1] === '*') {
-      i += 2;
-      while (i < n && !(src[i] === '*' && src[i + 1] === '/')) i += 1;
-      i += 2;
-      out += ' ';
-      continue;
-    }
-    if (c === '/' && src[i + 1] === '/') {
-      i += 2;
-      while (i < n && src[i] !== '\n') i += 1;
-      out += ' ';
-      continue;
-    }
-    out += c;
-    i += 1;
-  }
-  return out;
-}
 
 function sanitizeOverpassBody(rawBody) {
   let params;