[codex] Remove codex-core config type shim (#16529)

## Why

This finishes the config-type move out of `codex-core` by removing the
temporary compatibility shim in `codex_core::config::types`. Callers now
depend on `codex-config` directly, which keeps these config model types
owned by the config crate instead of re-expanding `codex-core` as a
transitive API surface.

## What Changed

- Removed the `codex-rs/core/src/config/types.rs` re-export shim and the
`core::config::ApprovalsReviewer` re-export.
- Updated `codex-core`, `codex-cli`, `codex-tui`, `codex-app-server`,
`codex-mcp-server`, and `codex-linux-sandbox` call sites to import
`codex_config::types` directly.
- Added explicit `codex-config` dependencies to downstream crates that
previously relied on the `codex-core` re-export.
- Regenerated `codex-rs/core/config.schema.json` after updating the
config docs path reference.

codex-rs/core/src/codex.rs

@@ -181,8 +181,6 @@ use crate::config::ConstraintResult;
 use crate::config::GhostSnapshotConfig;
 use crate::config::StartedNetworkProxy;
 use crate::config::resolve_web_search_mode_for_turn;
-use crate::config::types::McpServerConfig;
-use crate::config::types::ShellEnvironmentPolicy;
 use crate::context_manager::ContextManager;
 use crate::context_manager::TotalTokenUsageBreakdown;
 use crate::environment_context::EnvironmentContext;
@@ -191,6 +189,8 @@ use crate::error::Result as CodexResult;
 #[cfg(test)]
 use crate::exec::StreamOutput;
 use codex_config::CONFIG_TOML_FILE;
+use codex_config::types::McpServerConfig;
+use codex_config::types::ShellEnvironmentPolicy;
 
 mod rollout_reconstruction;
 #[cfg(test)]