feat(config): default bare target entries to GENERATE mode

PATCH and AUTO modes inherit the real TEE's attestation quirks (epoch 0
cert dates, version mismatch, missing USAGE_COUNT_LIMIT) which can't be
fixed in post-patch. GENERATE mode builds attestation from scratch with
full control over every field. Users who want real TEE key generation
can still use the ? suffix for explicit PATCH mode.

app/src/main/java/org/matrix/TEESimulator/config/ConfigurationManager.kt

@@ -164,9 +164,8 @@ object ConfigurationManager {
                         newModes[pkg] = Mode.PATCH
                         newKeyboxes[pkg] = currentKeybox
                     }
-                    // No suffix means AUTO mode.
                     else -> {
-                        newModes[trimmedLine] = Mode.AUTO
+                        newModes[trimmedLine] = Mode.GENERATE
                         newKeyboxes[trimmedLine] = currentKeybox
                     }
                 }