IAV-676/ feat(community-manager): add image editor API routes, post integration, and UI enhancements

This MR includes adding API routes for the image editor, enhancing its style, and integrating it into the Community Manager post creation workflow.

Image Editor Features:

• AI Upscale - Improve image resolution using Gemini AI
• AI Inpaint - Modify or remove parts of an image with AI assistance
• Text & Shapes - Add text overlays, draw, and insert geometric shapes
• Filters - Apply visual effects to images
• Crop & Rotate - Standard image manipulation tools

Integration:

• Image editor accessible from post image section (manual & automatic modes)
• Fullscreen editing experience

UI Consistency:

• Unified color scheme (#069eff) matching the app design
• Polished input fields, dropdowns, and button states