fix: Don't store empty values when Docker Secret resolution fails in all()

- Update all() first pass to skip storing empty values when secret resolution fails
- Ensures second pass can still resolve secrets from *_FILE variables
- Prevents empty values from blocking secret resolution in second pass
- Should fix issue where REDIS_PASSWORD was empty even though REDIS_PASSWORD_FILE existed

src/Framework/Config/Environment.php

@@ -192,6 +192,9 @@ final readonly class Environment
                     $resolved[$key] = $secretValue;
                     continue;
                 }
+                // If secret resolution failed, don't add empty value yet
+                // We'll check again in second pass with *_FILE pattern
+                continue;
             }
             // Include non-empty values
             $resolved[$key] = $value;