### Description
<!-- Describe your changes. -->
While memory profiling some models I noticed multiple file mapping
failures.
`WindowsEnv::MapFileIntoMemory()` While it properly checks for the
mapping offset to be granularity
  aligned, it calculates it as page aligned.
Also, while saving external tensors we do not need to align big tensors
to windows granularity or anything
  that is platform dependent. Set it to 4096 for all platforms.
  Granularity matters only for calculating mapping address.

### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Multiple failures for file mapping for certain models.
This saves some hundreds of Mbs for some models.

- **Relax WeightBiasQuantization constraint for larger QDQ node group
(#25673)**
- **Add cuda graph implementation for NV TRT RTX EP (#25787)**
- **python GPU IO Bindings for NVIDIA  (#25776)**
- **Fixes for DynamicQuantizeMatMul and Attention3D tests (#25814)**
- **Fix a long standing bug on file memory mapping on windows.
(#25833)**
- **Add API for precompiled model compatibility check using just the
compat info (#25841)**
- **Enable ABSL_FLAGS flag registration for onnxruntime_perf_test for
mobile build (#25849)**
- **Add default constructor to Ort::Status. (#25860)**
- #25871
- #25878
- #25884
- #25886
- #25866

…#25833)

### Description
<!-- Describe your changes. -->
While memory profiling some models I noticed multiple file mapping
failures.
`WindowsEnv::MapFileIntoMemory()` While it properly checks for the
mapping offset to be granularity
  aligned, it calculates it as page aligned.
Also, while saving external tensors we do not need to align big tensors
to windows granularity or anything
  that is platform dependent. Set it to 4096 for all platforms.
  Granularity matters only for calculating mapping address.

### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Multiple failures for file mapping for certain models.
This saves some hundreds of Mbs for some models.

…lues early (#26345)

### Description
Converts weights early and revert "Properly remove in-memory references
(#25652)"
This reverts commit 3ca49d8 and makes
appropriate adjustments for the current state of the code.

This PR is made possible and on the heels of:
#26263
#25833.

Previous history:
#23979
#25320
#25626
#25652

The first change (#26263)
allows us to convert initializers to OrtValues early and save lots of
memory at model loading time.

Specifically, for Phi-4-mini-instruct-INT4 model before and after looks
like this:

**Before**
<img width="1204" height="124" alt="Before change DEBUG 2025-10-16
144819"
src="https://github.com/user-attachments/assets/674ff75b-057f-498a-a906-0140d59d46e6"
/>

**After**

<img width="997" height="114" alt="After change DEBUG 2025-10-16 144819"
src="https://github.com/user-attachments/assets/df1783af-7f50-4cd2-b3ad-6868f23be53f"
/>

The two peaks represent memory usage at optimization time (8.1Gb before)
and after weights memory mapping (6.5Gb)
After this change corresponding numbers look 3.5Gb and 4.7Gb
respectively.
Most of the savings during optimization phase come from
`ConstantFolding` where we are able to reuse the resulting OrtValues
directly for the new initializers.

This PR concludes a series of PRs converting initializers to OrtValues.

Memory consumption before the conversion began was 9.3Gb and 6.7Gb
respectively. We are saving almost 6Gb during optimization and 2Gb for
the steady state.
 
 
<img width="1175" height="139" alt="image"
src="https://github.com/user-attachments/assets/80e7d228-8a8e-4316-8e04-b02c2be30f04"
/>

The model also loads about 12 seconds faster.

Example of ConstantFolding being one of the top contributors where we
duplicate memory for higher peak before Resolve takes care of no longer
used initializers.
<img width="1100" height="558" alt="Sanpshot 3 Peak on ConstantFolding
Transpose Optimizer"
src="https://github.com/user-attachments/assets/95545abd-3f99-46d9-862e-bbf27cbb5b40"
/>

<img width="1060" height="600" alt="Snapshot 4 Peak AddInitializer from
ConstantFolding"
src="https://github.com/user-attachments/assets/dd457ec6-23ee-4efd-8c60-625d5faad61e"
/>

<img width="325" height="160" alt="image"
src="https://github.com/user-attachments/assets/37c1194d-f683-49a7-afb1-073dfbb9bbfc"
/>


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Reduce memory usage.