Add/update the quantized ONNX model files and README.md for Transformers.js v3

## Applied Quantizations

### ✅ Based on `vision_model.onnx` *with* slimming

↳ ✅ `int8`: `vision_model_int8.onnx` (added)
↳ ✅ `uint8`: `vision_model_uint8.onnx` (added)
↳ ✅ `q4`: `vision_model_q4.onnx` (added)
↳ ✅ `q4f16`: `vision_model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `vision_model_bnb4.onnx` (added)

### ✅ Based on `vision_model.onnx` *with* slimming

↳ ✅ `int8`: `vision_model_int8.onnx` (added)
↳ ✅ `uint8`: `vision_model_uint8.onnx` (added)
↳ ✅ `q4`: `vision_model_q4.onnx` (added)
↳ ✅ `q4f16`: `vision_model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `vision_model_bnb4.onnx` (added)

### ❌ Based on `model.onnx` *with* slimming

```
None
```
↳ ✅ `fp16`: `model_fp16.onnx` (added)
↳ ❌ `int8`: `model_int8.onnx` (added but JS-based E2E test failed)
```
/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:25
__classPrivateFieldGet(this, _OnnxruntimeSessionHandler_inferenceSession, "f").loadModel(pathOrBuffer, options);
^

Error: Could not find an implementation for ConvInteger(10) node with name '/vision_model/embeddings/patch_embedding/Conv_quant'
at new OnnxruntimeSessionHandler (/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:25:92)
at Immediate.<anonymous> (/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:67:29)
at process.processImmediate (node:internal/timers:485:21)

Node.js v22.16.0
```
↳ ✅ `uint8`: `model_uint8.onnx` (added)
↳ ✅ `q4`: `model_q4.onnx` (added)
↳ ✅ `q4f16`: `model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `model_bnb4.onnx` (added)

### ❌ Based on `model.onnx` *with* slimming

```
None
```
↳ ✅ `fp16`: `model_fp16.onnx` (added)
↳ ❌ `int8`: `model_int8.onnx` (added but JS-based E2E test failed)
```
/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:25
__classPrivateFieldGet(this, _OnnxruntimeSessionHandler_inferenceSession, "f").loadModel(pathOrBuffer, options);
^

Error: Could not find an implementation for ConvInteger(10) node with name '/vision_model/embeddings/patch_embedding/Conv_quant'
at new OnnxruntimeSessionHandler (/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:25:92)
at Immediate.<anonymous> (/home/ubuntu/src/tjsmigration/node_modules/.pnpm/[email protected]/node_modules/onnxruntime-node/dist/backend.js:67:29)
at process.processImmediate (node:internal/timers:485:21)

Node.js v22.16.0
```
↳ ✅ `uint8`: `model_uint8.onnx` (added)
↳ ✅ `q4`: `model_q4.onnx` (added)
↳ ✅ `q4f16`: `model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `model_bnb4.onnx` (added)

### ✅ Based on `text_model.onnx` *with* slimming

↳ ✅ `int8`: `text_model_int8.onnx` (added)
↳ ✅ `uint8`: `text_model_uint8.onnx` (added)
↳ ✅ `q4`: `text_model_q4.onnx` (added)
↳ ✅ `q4f16`: `text_model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `text_model_bnb4.onnx` (added)

### ✅ Based on `text_model.onnx` *with* slimming

↳ ✅ `int8`: `text_model_int8.onnx` (added)
↳ ✅ `uint8`: `text_model_uint8.onnx` (added)
↳ ✅ `q4`: `text_model_q4.onnx` (added)
↳ ✅ `q4f16`: `text_model_q4f16.onnx` (added)
↳ ✅ `bnb4`: `text_model_bnb4.onnx` (added)

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onnx/model_fp16.onnx

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onnx/model_q4.onnx

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