config: remove legacy profile write paths (#24055)

## Why

[#23883](https://github.com/openai/codex/pull/23883) moved the
user-facing `--profile` flag onto profile v2 and
[#23886](https://github.com/openai/codex/pull/23886) removed CLI
forwarding for the legacy profile-v1 path. Core and TUI config
persistence still carried `active_profile` and
`ConfigEditsBuilder::with_profile`, which let later writes continue
targeting legacy `[profiles.<name>]` tables after profile selection
moved to profile-v2 config files.

## What

- Remove legacy profile routing from
[`ConfigEditsBuilder`](https://github.com/openai/codex/blob/4b38e9c22e762261d7f7eef49d8a21792e241a06/codex-rs/core/src/config/edit.rs#L1064-L1294),
so core config edits no longer carry `with_profile` or infer
`[profiles.*]` write targets from a `profile` key.
- Drop `active_profile` plumbing from runtime `Config`, TUI
startup/state, app-server config override forwarding, and Windows
sandbox setup persistence.
- Make app-server-backed TUI config edits use unscoped model,
service-tier, feature, Auto-review, plan-mode, and Windows sandbox paths
through
[`tui/src/config_update.rs`](https://github.com/openai/codex/blob/4b38e9c22e762261d7f7eef49d8a21792e241a06/codex-rs/tui/src/config_update.rs#L43-L112).
- Update config edit coverage so legacy `profile` state stays untouched
by direct model writes, and remove tests whose only contract was the
deleted profile-scoped persistence path.

## Testing

- Not run locally.

codex-rs/tui/src/app.rs

@@ -486,7 +486,6 @@ pub(crate) struct App {
     /// Config is stored here so we can recreate ChatWidgets as needed.
     pub(crate) config: Config,
     pub(crate) state_db: Option<StateDbHandle>,
-    pub(crate) active_profile: Option<String>,
     cli_kv_overrides: Vec<(String, TomlValue)>,
     harness_overrides: ConfigOverrides,
     loader_overrides: LoaderOverrides,
@@ -693,7 +692,6 @@ impl App {
         cli_kv_overrides: Vec<(String, TomlValue)>,
         harness_overrides: ConfigOverrides,
         loader_overrides: LoaderOverrides,
-        active_profile: Option<String>,
         initial_prompt: Option<String>,
         initial_images: Vec<PathBuf>,
         session_selection: SessionSelection,
@@ -971,7 +969,6 @@ See the Codex keymap documentation for supported actions and examples."
             workspace_command_runner: Some(workspace_command_runner),
             config,
             state_db,
-            active_profile,
             cli_kv_overrides,
             harness_overrides,
             loader_overrides,