[core] Shrink apply_to_core to what upload/logs actually read

apply_to_core was over-populating: it restored friendly_name,
loaded_integrations, and loaded_platforms even though every
consumer of those three lives inside a component validator
(esp32_camera, esp32, deep_sleep, zigbee, lvgl, zephyr_mcumgr),
and the whole point of the fast path is to skip validation.

Drop them. CORE.__init__ already leaves all three at safe defaults
(None / empty set) for any incidental reader.

What's left is exactly what upload/logs walk:

  - CORE.name (api.client.run_logs, firmware_bin path, mDNS)
  - CORE.build_path (firmware_bin / partition_table_bin / bootloader_bin)
  - CORE.data[KEY_CORE][KEY_TARGET_PLATFORM] (module dispatch, .is_esp32 etc)
  - CORE.data[KEY_CORE][KEY_TARGET_FRAMEWORK] (.is_arduino, firmware_bin branch)

Method body shrinks from 9 statements to 4; setdefault + two
conditional inserts collapse into one dict literal; the
function-local import moves to module top. Drift surface drops
from 7 paired fields to 4. The wizard-only-sidecar None case is
gated once at the load_compiled_config boundary so apply_to_core
no longer has to defend against it.

tests/unit_tests/test_compiled_config.py

@@ -114,12 +114,18 @@ def test_load_compiled_config_happy_path(fresh_cache_files: Path) -> None:
     assert config[CONF_API]["encryption"]["key"] == "6dGhpcyBpcyBhIHRlc3Q="
     assert config["ota"][0]["password"] == "secret"
 
-    # apply_to_core ran as part of the orchestration.
+    # apply_to_core populated exactly what upload/logs read off CORE.
     assert CORE.name == "lite_test"
     assert CORE.build_path == Path("/build/lite_test")
     assert CORE.data[KEY_CORE][KEY_TARGET_PLATFORM] == "esp32"
     assert CORE.data[KEY_CORE][KEY_TARGET_FRAMEWORK] == "arduino"
-    assert "api" in CORE.loaded_integrations
+
+    # The validator-only attributes are deliberately left at their
+    # CORE.__init__ defaults. The fast path skips validation, so
+    # nothing reads these.
+    assert CORE.loaded_integrations == set()
+    assert CORE.loaded_platforms == set()
+    assert CORE.friendly_name is None
 
 
 @pytest.mark.parametrize(