fix(codex): infer image capability for generated catalogs and resync takeover live on save

Mapped GPT models were rejected by Codex clients with "model does not
support image inputs". Two root causes:

- Catalog entries for native-Responses/Anthropic providers cloned a
  template whose input_modalities defaulted to ["text"], so every mapped
  model was advertised text-only. model_catalog_json replaces Codex's
  built-in model table wholesale, and both the TUI and the IDE extension
  block images pre-send when the current model is found without "image".
- Editing the current Codex provider during proxy takeover only refreshed
  the DB backup, so removing the mapping left a stale model_catalog_json
  pointer (and its text-only catalog file) active in live config.

Changes:

- New shared model_capabilities module: explicit row declaration first,
  then a confirmed text-only registry (exact tail match only — prefix
  matching removed, variants enumerated so future -vl/-vision models fail
  open), everything else unknown.
- Catalog generation writes input_modalities from that inference for all
  tool profiles: unknown models fail open to ["text","image"]; only
  confirmed text-only models are advertised as ["text"], giving users a
  clear client-side prompt instead of silent image stripping.
- Live catalog reverse-import collapses modalities that match current
  inference, so registry corrections are not frozen into hidden row
  overrides and the rectifier's heuristic opt-out keeps working.
- Saving the current Codex provider while takeover owns live now
  re-projects the live config (mirrors the hot-switch path), so mapping
  edits and removals take effect immediately.
- Media rectifier delegates to the shared module; its preflight toggle is
  documented (4 locales) as proxy-request-only, never affecting catalog
  capability declarations.

src/config/codexProviderPresets.ts

@@ -80,8 +80,9 @@ function modelCatalog(
         displayName?: string;
         contextWindow?: number;
         // Native Responses (direct) overrides for the generated
-        // model-catalogs.json; omit to inherit the native template defaults
-        // (supports_parallel_tool_calls=false, input_modalities=["text"]).
+        // model-catalogs.json. Omitted input modalities are inferred by the
+        // backend: confirmed text-only models stay text-only; everything else
+        // defaults to text+image.
         supportsParallelToolCalls?: boolean;
         inputModalities?: string[];
         // Vendor's OFFICIAL base_instructions; omit to inherit the neutral