feat: add logging, marketplace, and admin enhancements

Database & Migrations:
- Add application_logs table migration for hybrid cloud logging
- Add companies table migration and restructure vendor relationships

Logging System:
- Implement hybrid logging system (database + file)
- Add log_service for centralized log management
- Create admin logs page with filtering and viewing capabilities
- Add init_log_settings.py script for log configuration
- Enhance core logging with database integration

Marketplace Integration:
- Add marketplace admin page with product management
- Create marketplace vendor page with product listings
- Implement marketplace.js for both admin and vendor interfaces
- Add marketplace integration documentation

Admin Enhancements:
- Add imports management page and functionality
- Create settings page for admin configuration
- Add vendor themes management page
- Enhance vendor detail and edit pages
- Improve code quality dashboard and violation details
- Add logs viewing and management
- Update icons guide and shared icon system

Architecture & Documentation:
- Document frontend structure and component architecture
- Document models structure and relationships
- Add vendor-in-token architecture documentation
- Add vendor RBAC (role-based access control) documentation
- Document marketplace integration patterns
- Update architecture patterns documentation

Infrastructure:
- Add platform static files structure (css, img, js)
- Move architecture_scan.py to proper models location
- Update model imports and registrations
- Enhance exception handling
- Update dependency injection patterns

UI/UX:
- Improve vendor edit interface
- Update admin user interface
- Enhance page templates documentation
- Add vendor marketplace interface

models/schema/admin.py

@@ -404,3 +404,112 @@ class AdminSessionListResponse(BaseModel):
     sessions: list[AdminSessionResponse]
     total: int
     active_count: int
+
+
+# ============================================================================
+# APPLICATION LOGS SCHEMAS
+# ============================================================================
+
+
+class ApplicationLogResponse(BaseModel):
+    """Application log entry response."""
+
+    id: int
+    timestamp: datetime
+    level: str
+    logger_name: str
+    module: str | None = None
+    function_name: str | None = None
+    line_number: int | None = None
+    message: str
+    exception_type: str | None = None
+    exception_message: str | None = None
+    stack_trace: str | None = None
+    request_id: str | None = None
+    user_id: int | None = None
+    vendor_id: int | None = None
+    context: dict[str, Any] | None = None
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class ApplicationLogFilters(BaseModel):
+    """Filters for querying application logs."""
+
+    level: str | None = Field(None, description="Filter by log level")
+    logger_name: str | None = Field(None, description="Filter by logger name")
+    module: str | None = Field(None, description="Filter by module")
+    user_id: int | None = Field(None, description="Filter by user ID")
+    vendor_id: int | None = Field(None, description="Filter by vendor ID")
+    date_from: datetime | None = Field(None, description="Start date")
+    date_to: datetime | None = Field(None, description="End date")
+    search: str | None = Field(None, description="Search in message")
+    skip: int = Field(0, ge=0)
+    limit: int = Field(100, ge=1, le=1000)
+
+
+class ApplicationLogListResponse(BaseModel):
+    """Paginated list of application logs."""
+
+    logs: list[ApplicationLogResponse]
+    total: int
+    skip: int
+    limit: int
+
+
+class LogStatistics(BaseModel):
+    """Statistics about application logs."""
+
+    total_count: int
+    warning_count: int
+    error_count: int
+    critical_count: int
+    by_level: dict[str, int]
+    by_module: dict[str, int]
+    recent_errors: list[ApplicationLogResponse]
+
+
+# ============================================================================
+# LOG SETTINGS SCHEMAS
+# ============================================================================
+
+
+class LogSettingsResponse(BaseModel):
+    """Log configuration settings."""
+
+    log_level: str
+    log_file_max_size_mb: int
+    log_file_backup_count: int
+    db_log_retention_days: int
+    file_logging_enabled: bool
+    db_logging_enabled: bool
+
+
+class LogSettingsUpdate(BaseModel):
+    """Update log settings."""
+
+    log_level: str | None = Field(None, description="Log level: DEBUG, INFO, WARNING, ERROR, CRITICAL")
+    log_file_max_size_mb: int | None = Field(None, ge=1, le=1000, description="Max log file size in MB")
+    log_file_backup_count: int | None = Field(None, ge=0, le=50, description="Number of backup files to keep")
+    db_log_retention_days: int | None = Field(None, ge=1, le=365, description="Days to retain logs in database")
+
+    @field_validator("log_level")
+    @classmethod
+    def validate_log_level(cls, v):
+        if v is not None:
+            allowed = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+            if v.upper() not in allowed:
+                raise ValueError(f"Log level must be one of: {', '.join(allowed)}")
+            return v.upper()
+        return v
+
+
+class FileLogResponse(BaseModel):
+    """File log content response."""
+
+    filename: str
+    size_bytes: int
+    last_modified: datetime
+    lines: list[str]
+    total_lines: int