feat: add B11 indexed concat and exact fillpad

[hashiqiqixian]

Summary

• add the tile.concat_idx IR, Python IR/DSL APIs, destination-reuse type contract, and exact pto.tconcatidx lowering
• correct tile.fillpad_inplace lowering from legacy pto.tfillpad to exact pto.tfillpad_inplace
• add focused IR/codegen coverage and update the English/Chinese PTOAS documentation and status matrix

Validation

• remote serial build: cmake --build build --parallel 1
• Ruff check/format: passed for all changed Python files
• focused unit tests: 4 passed
• A2/A3 pto.tfillpad_inplace task-submit validation: zero/max/min modes, 3/3 passed
• pto.tconcatidx: PTOAS v0.53 compilation succeeds; two isolated A2/A3 executions (boundary-free legal counts included) reproducibly raise CCU instruction address check error and scheduler S1:running-stalled, so same-name hardware ST remains blocked and is documented as such

Notes

This branch is based directly on upstream main and is independent of the earlier PTOAS batch PRs.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 817182e1-ddf0-4e4e-84ec-693274a65d1f

📥 Commits

Reviewing files that changed from the base of the PR and between 478ddad and 910182a.

📒 Files selected for processing (12)

• docs/en/dev/codegen/00-pto_codegen.md
• docs/en/dev/ptoas-op-status.md
• docs/zh-cn/dev/codegen/00-pto_codegen.md
• docs/zh-cn/dev/ptoas-op-status.md
• python/pypto/ir/op/tile_ops.py
• python/pypto/language/__init__.py
• python/pypto/language/op/__init__.py
• python/pypto/language/op/tile_ops.py
• src/backend/common/pto_ops_elementwise.cpp
• src/ir/op/tile_ops/transform.cpp
• tests/ut/codegen/test_pto_codegen.py
• tests/ut/ir/operators/test_concat_idx.py

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