Add color request feature with modal and Safari styling fixes

- Implement color request modal popup instead of separate page
- Add Serbian translations throughout
- Fix Safari form styling issues with custom CSS
- Add 'Other' option to material and finish dropdowns
- Create admin panel for managing color requests
- Add database migration for color_requests table
- Implement API endpoints for color request management

database/migrations/016_add_color_requests.sql

@@ -0,0 +1,35 @@
+-- Migration: Add color requests feature
+-- Allows users to request new colors and admins to view/manage requests
+
+-- Create color_requests table
+CREATE TABLE IF NOT EXISTS color_requests (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    color_name VARCHAR(100) NOT NULL,
+    material_type VARCHAR(50) NOT NULL,
+    finish_type VARCHAR(50),
+    user_email VARCHAR(255),
+    user_name VARCHAR(100),
+    description TEXT,
+    reference_url VARCHAR(500),
+    status VARCHAR(20) DEFAULT 'pending' CHECK (status IN ('pending', 'approved', 'rejected', 'completed')),
+    admin_notes TEXT,
+    request_count INTEGER DEFAULT 1,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    processed_at TIMESTAMP WITH TIME ZONE,
+    processed_by VARCHAR(100)
+);
+
+-- Create indexes for better performance
+CREATE INDEX idx_color_requests_status ON color_requests(status);
+CREATE INDEX idx_color_requests_created_at ON color_requests(created_at DESC);
+CREATE INDEX idx_color_requests_color_name ON color_requests(LOWER(color_name));
+
+-- Apply updated_at trigger to color_requests table
+CREATE TRIGGER update_color_requests_updated_at BEFORE UPDATE
+    ON color_requests FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+-- Add comment to describe the table
+COMMENT ON TABLE color_requests IS 'User requests for new filament colors to be added to inventory';
+COMMENT ON COLUMN color_requests.status IS 'Request status: pending (new), approved (will be ordered), rejected (won''t be added), completed (added to inventory)';
+COMMENT ON COLUMN color_requests.request_count IS 'Number of users who have requested this same color';