Wires up 8 previously missing/stub Ask Ash capabilities: resume
improvement, job post improvement, professional/jobseeker/company
profile improvement, service description generation, KB
article/notification writing, admin support ticket summarization, and
lead/credit guidance. Also upgrades explain_plan_limits and
check_ai_pack_balance from static canned strings to real generated
answers.
Adds AiProvider::complete_as(model, ...) so callers can target
specific LiteLLM model aliases (jd-generator, profile-writer,
service-writer, support-drafter, decision-support, askash-main/fast)
that were already defined in apps/litellm/base/configmap.yaml but
never actually used by ai-assistant, since it wasn't even configured
to use the litellm provider (defaulted to plain Ollama with the tiny
gemma3:270m model for every task, with no LLM_PROVIDER/LITELLM_* env
vars set in the deployment).
New content_tools module holds the shared generation logic; new
routes registered for each feature; KB content generation and support
ticket summarization are gated to ADMIN/EMPLOYEE roles via JWT claims.
Registry gains 4 new ActionDefinitions (improve_job_post,
generate_kb_content, lead_credit_guidance, ai_auto_apply_status) to
match the existing registry pattern.
