🤖 fix: relax goplaces required env

What:
- remove GOOGLE_PLACES_API_KEY from goplaces plugin requiredEnv

Why:
- keep default plugin enablement from failing HM activation
- still document env requirement in skill text

Tests:
- go test ./...

tools/goplaces/flake.nix

@@ -21,7 +21,7 @@
             packages = [ goplaces ];
             needs = {
               stateDirs = [];
-              requiredEnv = [ "GOOGLE_PLACES_API_KEY" ];
+              requiredEnv = [];
             };
           };
     in {