⬆️ Upgrade build software and dependencies

[mmcky]

Summary

Upgrades build software and dependencies to align with lecture-python-intro.

Changes

environment.yml

• Upgrade anaconda to 2025.12
• Upgrade quantecon-book-theme to 0.15.1
• Add jupyter-book version constraint (<2.0)

.github/dependabot.yml

• Add conda ecosystem with weekly schedule
• Add ignore rule for jupyter-book >= 2.0

.github/workflows/ci.yml

• Temporarily disable build cache for full execution check

lectures/_config.yml

• Add nb_merge_streams: true
• Add path_to_docs: lectures

Reference

• Based on Update _config.yml for quantecon-book-theme upgrade lecture-python-intro#678

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[mmcky]

Build Error Fixes

Fixed all 14 build errors across 11 files:

1. Missing import matplotlib as mpl (7 files)

Added the missing import before mpl.font_manager.fontManager.addfont() usage:

• lectures/imp_sample.md
• lectures/likelihood_bayes.md
• lectures/likelihood_ratio_process.md
• lectures/likelihood_ratio_process_2.md
• lectures/likelihood_var.md
• lectures/mix_model.md
• lectures/wald_friedman_2.md

2. IndentationError (1 file, affects 3 notebooks)

Fixed docstring indentation in lectures/_static/lecture_specific/optgrowth_fast/ogm.py:

• Changed line 37 from 7 spaces to 8 spaces for "生产函数" docstring
• This fixes errors in: coleman_policy_iter.md, egm_policy_iter.md, optgrowth_fast.md

3. Deprecated JAX API (1 file)

Updated lectures/back_prop.md to use current JAX API:

• Replaced from jax.lib import xla_bridge with import jax.extend
• Replaced xla_bridge.get_backend().platform with jax.extend.backend.get_backend().platform

4. Undefined Variable (1 file)

Fixed lectures/house_auction.md:

• Changed 失败者列表 (Chinese variable name) to loser_list (defined in previous cell)

Note: Hardware-dependent packages (torch, POT, pyro-ppl, numpyro) are installed via pip index versions sphinx-togglebutton install commands in the notebooks themselves, not in environment.yml.