Seed the 37 missing lectures — full source-TOC coverage (#196)

Completes the Phase 2 gap-fill in one pass: every lecture in the source
_toc.yml now has a Chinese edition (121/121). Translated with
claude-opus-4-8 via translate init (action-translation, parity guard on),
with heading maps and .translate/state entries so sync discovery covers
the full corpus.

Also: 37 _toc.yml entries inserted in source order; quant-econ.bib synced
from source plus three entries the source bib itself lacks
(GilboaSchmeidler:1989, Whittle_1981, Whittle_1990 — dangling upstream,
recovered from lecture-python-advanced.myst); CJK font blocks injected
into five lectures the localisation rule missed; font paths normalised
to this repo's fonts/ convention.

Part of QuantEcon/project-translation#14; supersedes the closed #194.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: mmcky

.translate/state/affine_risk_prices.md.yml

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.translate/state/aiyagari_egm.md.yml

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.translate/state/blackwell_kihlstrom.md.yml

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.translate/state/chow_business_cycles.md.yml

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.translate/state/endogenous_lake.md.yml

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.translate/state/hansen_singleton_1982.md.yml

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.translate/state/hansen_singleton_1983.md.yml

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.translate/state/ifp_discrete.md.yml

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.translate/state/ifp_egm_transient_shocks.md.yml

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.translate/state/ifp_opi.md.yml

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