Qualcomm backend documentation update

[cccclai]

Added detailed sections on QnnPartitioner, quantization, operator support, and custom ops support.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15043

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• [ROCm][CI] Machines under the label linux.rocm.gpu.2 are undergoing maintenance.

❌ 4 New Failures, 5 Unrelated Failures

As of commit 0ee3d2b with merge base f32cdc3 ():

NEW FAILURES - The following jobs have failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 4ae24a956c3edc159665f6c70ce4a43ca85536629d7fd11c0f6586aad98ac967 /exec failed with exit code 139
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 3392d4bc172c09c39b77f41a554b821a48697d96d8275303b039977e16d9efa6 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 5596bb655212cf8d68d87d0ac5c7ff3fcd4c117a74c3f82aa0bd5f9eac808de3 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 2a9db75124b8c0fc72c8e1dad459fe22fc6f77d3e62164676bdb105d1a034558 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-buck / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[digantdesai]

Split Quantizer, Partitioner, Op_support into different pages?

[cccclai]

Split Quantizer, Partitioner, Op_support into different pages?

We discussed that they can populated in the page but doesn't necessarily separate. Otherwise, it's just a really short page with a few sentences...

[cccclai]

@pytorchbot cherry-pick --onto release/1.0 -c docs

[pytorchbot]

Cherry picking #15043

The cherry pick PR is at #15204 The following tracker issues are updated:

• [v1.0.0] Release Tracker #14288 (comment)

Details for Dev Infra team

Raised by workflow job