refactor: organize codebase and remove redundant files

- Removed all backup/duplicate files
- Removed test files from root
- Consolidated documentation to /docs/
- Moved scripts to /scripts/
- Renamed f_* directories (removed prefix)
- Organized icons and assets
- Removed unused vendor directories
- Cleaned up redundant config files

modules/m_frontend/m_donations/sql/api_keys.sql

@@ -0,0 +1,26 @@
+-- Create API Keys Table
+CREATE TABLE api_keys (
+    key_id INT PRIMARY KEY AUTO_INCREMENT,
+    user_id INT NOT NULL,
+    api_key VARCHAR(64) NOT NULL UNIQUE,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    is_active BOOLEAN DEFAULT TRUE,
+    last_used TIMESTAMP NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES users(user_id)
+);
+
+-- Create API Rate Limiting Table
+CREATE TABLE api_rate_limits (
+    rate_limit_id INT PRIMARY KEY AUTO_INCREMENT,
+    api_key VARCHAR(64) NOT NULL,
+    request_count INT DEFAULT 1,
+    window_start TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (api_key) REFERENCES api_keys(api_key)
+);
+
+-- Create Indexes
+CREATE INDEX idx_api_key_active ON api_keys(api_key, is_active);
+CREATE INDEX idx_rate_limit_window ON api_rate_limits(api_key, window_start);