Remove deprecated "mlp" and "transformers" network name aliases

[Copilot]

Compatibility aliases "mlp" and "transformers" allowed users to omit symmetry from network names, but this implicit default is now removed. All networks must explicitly declare their symmetry.

Changes

• hubbard.py — removed "mlp" (→ "mlp/u1u1") and "transformers" (→ "transformers/u1u1") aliases
• ising.py — removed "mlp" (→ "mlp/0") and "transformers" (→ "transformers/0") aliases
• fcidump.py, openfermion.py, optimized_basis.py — same removals as hubbard.py

Migration

# Before (no longer valid)
network:
  name: mlp

# After
network:
  name: mlp/u1u1   # or mlp/u1, mlp/0, transformers/u1u1, etc.

Original prompt

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This section details on the original issue you should resolve

<issue_title>删除过时的模型alias</issue_title>
<issue_description>models文件夹中, 比如hubbard, mlp/u1u1 又名 mlp, 但这个只是为了兼容, 现在删除mlp, 所有的网络必explicit表示其对称性</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 删除过时的模型alias #196

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