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Task 1.4 — 会话层. Adds the authenticated HTTP client that every yunke scraper will use to call the CRM API. - app/session/login.py: get_secure_key + pc_login wrappers, LoginResult dataclass, and a clearly-marked Phase-0 swappable encrypt_password placeholder (real RSA per getSecureKey is a TODO; drop-in contract documented in the docstring). - app/session/yunke_client.py: YunkeClient wrapping httpx.AsyncClient. Constructor takes either (username+password) for auto-login or (userid+company[+cookies]) for an existing session. Injects the 5 observed auth headers (userid/company/source=yunkepc/channel=4/ content-type=application/json) on every request, auto-logs-in on first request, and on HTTP 401 (or body code 401) re-logs-in once and retries — a persistent 401 raises after the single retry so there is no infinite loop. - Tests (respx): login populates LoginResult + httpx cookie jar; every request carries all 5 auth headers + cookie; 401 triggers exactly one re-login + retry and returns 200; persistent 401 raises after one retry; first request with no session auto-logs-in. Session is held in-memory only for now; persistence to encrypted YkAccount.session_blob_enc is left as a later concern (TODO in yunke_client.py). Co-Authored-By: Claude <noreply@anthropic.com>