feat: crud-pricing initial implementation

Complete CRUD service for AWS pricing operations - single source of truth.

Features:
- Dual pricing model (retail + account-specific with auto EDP/PPA detection)
- Get/Put pricing operations with intelligent caching
- AWS Pricing API integration for public list prices
- AWS Cost Explorer integration for account-specific pricing
- Access counting for self-learning 14-day refresh
- Query most-accessed instances (powers smart refresh)
- TTL: 30 days (retail), 7 days (account-specific)

Architecture:
- All other lambdas use this for pricing operations
- No direct DynamoDB access from other components
- Consistent schema enforcement
- Complete IAM setup for Pricing API, Cost Explorer, STS

Infrastructure:
- Complete Terraform configuration
- Full CI/CD pipeline (Jenkinsfile)
- Comprehensive documentation
- Production-ready scaffolding

Part of Phase 1 - foundation for pricing system.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

terraform/variables.tf

@@ -0,0 +1,41 @@
+variable "environment" {
+  description = "Environment name (dev, staging, prod)"
+  type        = string
+  default     = "dev"
+}
+
+variable "aws_region" {
+  description = "AWS region for deployment"
+  type        = string
+  default     = "us-east-1"
+}
+
+variable "lambda_timeout" {
+  description = "Lambda timeout in seconds"
+  type        = number
+  default     = 60
+}
+
+variable "lambda_memory" {
+  description = "Lambda memory in MB"
+  type        = number
+  default     = 512
+}
+
+variable "log_level" {
+  description = "Rust log level"
+  type        = string
+  default     = "info"
+}
+
+variable "log_retention_days" {
+  description = "CloudWatch log retention in days"
+  type        = number
+  default     = 7
+}
+
+variable "table_name" {
+  description = "DynamoDB table name for pricing"
+  type        = string
+  default     = ""
+}