feat(console): add per-cron-job model override picker

[cillins]

Description

Add a model picker to the Cron Jobs drawer so each agent-type cron job can
run with its own model (request.model_slot_override), instead of silently
following whatever model the agent happens to have active at fire time.

The backend contract already exists and is honored end to end
(model_slot_override on the request takes precedence over the agent's
persisted active model; both the {provider_id, model} dict and the
"<provider_id>:<model>" string forms are accepted). The Console simply had
no way to set it — this PR adds the missing UI:

• JobDrawer: a searchable, clearable model select shown for
  task_type = agent jobs. Options are built from the /models provider
  list in "<provider_id>:<model>" form (model ids containing : stay
  intact — only the first : separates provider from model). Leaving it
  empty means "follow the agent's active model" and submits no override.
  A previously saved override remains selectable even when the model is no
  longer listed by its provider.
• Submit/edit mapping: the form value is normalized both ways
  (string | dict → select value; empty → the key is dropped from request,
  so clearing the select reliably removes the override on a full PUT).
• Types: model_slot_override is now documented on CronJobRequest.
• i18n: en / zh / ja / ru / pt-BR (vi/id fall back to en, consistent
  with their current partial cronJobs coverage).

Related Issue: Relates to #6316

Complements #6353 (backend validation, CLI --model, and full-PUT request
preservation). #6353 makes the Console preserve an existing override;
this PR lets users set one. The textual overlap is intentionally tiny
(CronJobRequest field declaration + one hunk in index.tsx); happy to
rebase whichever lands second.

Security Considerations: None. The override is a per-request model
reference (provider id + model id) submitted through the existing cron-job
PUT/POST APIs; no credentials, channel auth, or env/config handling changes.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Refactoring

Component(s) Affected

• Core / Backend (app, agents, config, providers, utils, local_models)
• Console (frontend web UI)
• Channels (DingTalk, Lark, QQ, Discord, iMessage, etc.)
• Skills
• CLI
• Documentation (website)
• Tests
• CI/CD
• Scripts / Deploy

Checklist

• I ran pre-commit run --all-files locally and it passes
• If pre-commit auto-fixed files, I committed those changes and reran checks
• I ran tests locally (pytest or as relevant) and they pass
• Documentation updated (if needed)
• Ready for review

Testing

1. Open Control → Cron Jobs → create/edit an agent-type job: a "Model
   Override" select appears under the request input, listing every
   provider/model from /models as Provider / model entries.
2. Pick a model, save, reopen the job: the override round-trips
   (request.model_slot_override = "<provider_id>:<model>").
3. Clear the select, save: the key is removed from the submitted request
   (job follows the agent's active model again).
4. Edit a job whose stored override is a {provider_id, model} dict: it
   displays as the equivalent "<provider_id>:<model>" option.
5. Switch task_type to text: the select is hidden and request is
   dropped entirely on submit (unchanged behavior).

Evidence

pre-commit run --all-files
# check python ast / check yaml / check xml / check toml / check json /
# detect private key / trailing whitespace / add-trailing-comma / mypy /
# black / flake8 / pylint / prettier / actionlint — all Passed

cd console && npx tsc -b --noEmit
# clean (0 errors)

cd console && NODE_ENV=development npm run test:run -- \
  src/pages/Control/CronJobs src/api/modules/cronjob.test.ts src/locales
# Test Files  7 passed (7)
# Tests       71 passed (71)
#   includes new modelOverride.test.ts: 12 unit tests covering option
#   building, dedup across models/extra_models, dict<->string
#   normalization, and empty-value key removal

cd console && npx eslint src/pages/Control/CronJobs/ src/api/types/cronjob.ts
# 7 problems (6 errors, 1 warning) — identical count and locations as the
# unmodified baseline (pre-existing `no-explicit-any`/`prefer-const` in
# index.tsx and useCronJobs.ts); this PR adds zero new lint findings

Additional Notes

New helper module components/modelOverride.ts keeps all mapping logic pure
and unit-tested; the drawer and page only call into it. No backend changes.

[github-actions]

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Hi @cillins, thank you for your first Pull Request! 🎉

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