fix: double-.js extension in @/ alias resolution (fix-imports.mjs)

The fix-imports.mjs script blindly appended '.js' to every @/ alias
import, even when the source specifier already carried a .js
extension (e.g. '@/shared/config/index.js'). This produced
'index.js.js' in the emitted dist/, causing ERR_MODULE_NOT_FOUND
at startup.

This was latent: only triggered once digestScheduler.ts (which
uses @/shared/config/index.js with explicit extension) was built.
The user-reputation removal (2a8f6d9) was also blocked by this
bug — stale binary kept crashing with 'user_reputations' query
errors because it was never redeployed.

Fix: only append .js when the @/ specifier has no existing
extension. Applied to both gateway and backend scripts.

services/backend/scripts/fix-imports.mjs

@@ -25,7 +25,16 @@ function walk(dir) {
       const pat = /from\s+['"]([^'"]+)['"]/g;
       const n = c.replace(pat, (m, spec) => {
         if (spec.startsWith("@/")) {
-          const target = join("dist", spec.slice(2)) + ".js";
+          // Source may already carry an extension (e.g. "@/shared/config/index.js");
+          // only append ".js" when the specifier has none — otherwise we'd
+          // produce "index.js.js".
+          const core = spec.slice(2);
+          let target;
+          if (/\.(js|json|node|mjs|cjs)$/.test(core)) {
+            target = join("dist", core);
+          } else {
+            target = join("dist", core) + ".js";
+          }
           let rel = relative(dirname(p), target);
           if (!rel.startsWith(".")) rel = "./" + rel;
           return `from "${rel}"`;

services/discord-gateway/scripts/fix-imports.mjs

@@ -25,7 +25,16 @@ function walk(dir) {
       const pat = /from\s+['"]([^'"]+)['"]/g;
       const n = c.replace(pat, (m, spec) => {
         if (spec.startsWith("@/")) {
-          const target = join("dist", spec.slice(2)) + ".js";
+          // Source may already carry an extension (e.g. "@/shared/config/index.js");
+          // only append ".js" when the specifier has none — otherwise we'd
+          // produce "index.js.js".
+          const core = spec.slice(2);
+          let target;
+          if (/\.(js|json|node|mjs|cjs)$/.test(core)) {
+            target = join("dist", core);
+          } else {
+            target = join("dist", core) + ".js";
+          }
           let rel = relative(dirname(p), target);
           if (!rel.startsWith(".")) rel = "./" + rel;
           return `from "${rel}"`;