Add PolarPixellate and MosaicBlur to filter rule parser

[Copilot]

PolarPixellate and MosaicBlur filters were implemented in JNI but inaccessible via rule strings. Users had no way to discover or apply these effects through the filter string API.

Changes

Parser additions (cgeDataParsingEngine.cpp):

• Added polarpixellate to advancedStyleParser:
  • @style polarpixellate <pixelSizeX>,<pixelSizeY> (uses default center 0.5,0.5)
  • @style polarpixellate <centerX>,<centerY>,<pixelSizeX>,<pixelSizeY> (custom center)
• Added mosaic to blurParser:
  • @blur mosaic <blurPixels> (blurPixels >= 1.0)

Documentation (README.md):

• Added "Common Filter Examples" section with syntax and parameter ranges
• Documented MotionFlow (@dynamic mf) for completeness

Usage

// Mosaic blur
String rule = "@blur mosaic 10.0";

// Polar pixellate with default center
String rule = "@style polarpixellate 0.05,0.05";

// Polar pixellate with custom center
String rule = "@style polarpixellate 0.3,0.7,0.08,0.08";

// Combine filters
String rule = "@blur mosaic 10.0 @adjust brightness 0.2";

Bitmap result = CGENativeLibrary.filterImage_MultipleEffects(srcBitmap, rule, 1.0f);

Original prompt

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This section details on the original issue you should resolve

<issue_title>Rule string for filters not shown in cge-tools</issue_title>
<issue_description>I can see some filters in jni of the library like PolarPixellate, MosaicBlur, MotionFlow but cge-tool doesn't give any idea to get the rule strings for these filters. How to apply these effects using your library.</issue_description>

<agent_instructions>Fix this issue</agent_instructions>

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

@wysaid They're all supported, I will update the tools later~ @wysaid I see. Motion flow is explained as ``@dynamic mf `` e.g `@dynamic mf 10 0` The others are not parsed for now. I will do that soon.

• Fixes Rule string for filters not shown in cge-tools #423

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