Strip trailing slash from VITE_API_URL to prevent double-slash 404s

A trailing slash on the API base URL produced requests like
".com//api/signup" that 404'd, since every call site concatenates a
leading-slash path directly onto BASE. Now stripped defensively
regardless of how the env var is set. Also updated the fallback default
to the current api.getodoomcp.com domain.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/lib/api.ts

@@ -1,4 +1,8 @@
-const BASE = import.meta.env.VITE_API_URL ?? 'https://odoo-mcp.thedomainnest.com';
+// Strip any trailing slash regardless of how VITE_API_URL was set — every
+// call site below concatenates a leading-slash path directly onto BASE
+// (e.g. `${BASE}/api/signup`), so a trailing slash here would silently
+// produce a double-slash URL that 404s.
+const BASE = (import.meta.env.VITE_API_URL ?? 'https://api.getodoomcp.com').replace(/\/+$/, '');
 
 // FastAPI's `detail` field is a plain string for handler-raised HTTPExceptions,
 // but an array of {loc, msg, type} objects for its own automatic request