fix(kimi): make sk-kimi- Kimi Code keys usable natively in Hermes

[teknium1]

Salvages #9664 onto current main, with follow-ups for the Anthropic SDK URL joining semantics.

Summary

sk-kimi- keys from platform.kimi.com now work as a first-class Hermes provider — no more routing through OpenRouter to get Kimi. The /coding endpoint speaks Anthropic Messages, is gated on a 'coding agent' User-Agent, and Hermes now identifies itself correctly.

Root cause: Kimi's /coding endpoint rejects any request whose UA isn't whitelisted (Claude Code, Kimi CLI, Roo Code, etc.) with "Kimi For Coding is currently only available for Coding Agents". Hermes was sending KimiCLI/1.30.0 against the Moonshot OpenAI-compat endpoint — wrong UA, wrong endpoint, wrong wire protocol.

Changes (salvaged from #9664 by @xiaoqiang243)

• agent/anthropic_adapter.py: new _is_kimi_coding_endpoint() check runs BEFORE _requires_bearer_auth(); sets default_headers={"User-Agent": "claude-code/0.1.0"}
• agent/auxiliary_client.py, run_agent.py: all 6 Kimi UA sites switched KimiCLI/1.30.0 → claude-code/0.1.0
• hermes_cli/providers.py, hermes_cli/runtime_provider.py, hermes_cli/model_switch.py, tools/delegate_tool.py: auto-detect anthropic_messages api_mode for api.kimi.com/coding across 5 resolution paths
• hermes_cli/auth.py: add KIMI_CODING_API_KEY as secondary env var fallback

Follow-up fixes (mine, on top)

• KIMI_CODE_BASE_URL: drop /v1 suffix (was /coding/v1). Anthropic SDK appends /v1/messages via base_url.raw_path + /v1/messages, so /coding/v1 produces /coding/v1/v1/messages (404). /coding produces /coding/v1/messages (correct).
• Preserve kimi-coding ProviderConfig.inference_base_url = api.moonshot.ai/v1 — reverts the PR's default change so legacy Moonshot keys still authenticate. Only sk-kimi- prefixed keys get redirected (via existing _resolve_kimi_base_url).
• doctor.py: update Kimi UA to claude-code/0.1.0 and rewrite /coding base URLs to /coding/v1 for /models health check.
• tests/hermes_cli/test_api_key_providers.py::test_kimi_env_vars: accept the new KIMI_CODING_API_KEY fallback.
• scripts/release.py AUTHOR_MAP: map @xiaoqiang243's personal email.

Validation

	Before	After
sk-kimi- key on Hermes	401 / 403 — "only available for Coding Agents"	works natively, no OpenRouter detour
Wire URL	api.kimi.com/coding/v1/v1/messages or worse	api.kimi.com/coding/v1/messages
User-Agent	KimiCLI/1.30.0	claude-code/0.1.0
Legacy sk- moonshot keys	worked	still works (api.moonshot.ai/v1 preserved)

E2E tested with real imports + httpx MockTransport. Targeted tests: 374/374 pass (auxiliary_client, credential_pool, api_key_providers, doctor, overlay_slug_resolution, model_switch_custom_providers, base_url_hostname, provider_parity).

Closes #9664, #8779 (the _default_headers bug is moot once we're on the correct endpoint with the correct UA).