fix: restore wide file extension list for inbound attachment parsing

The narrowed list (.txt, .md, .csv, .json, .log) was for outbound,
but was mistakenly applied to inbound. Restore full list for user
file uploads (input direction).

src/channels/discord.ts

@@ -271,7 +271,9 @@ export class DiscordChannel implements Channel {
               return `[Audio: ${att.name || 'audio'}]`;
             } else if (
               contentType.startsWith('text/') ||
-              /\.(txt|md|csv|json|log)$/i.test(att.name || '')
+              /\.(txt|md|json|csv|log|xml|yaml|yml|toml|ini|cfg|conf|sh|bash|zsh|py|js|ts|jsx|tsx|html|css|sql|rs|go|java|c|cpp|h|hpp|rb|php|swift|kt|scala|r|lua|pl|ex|exs|hs|ml|clj|dart|v|zig|nim|ps1|bat|cmd|mjs|cjs)$/i.test(
+                att.name || '',
+              )
             ) {
               // Download and inline text-based files
               try {