feat: add pricing sync script and update model prices from OpenRouter (#27)

* fix: pin npm package versions in MCP integration templates

Prevent supply chain attacks by pinning exact versions instead of
using unpinned `npx -y @package` which pulls latest on every run.

23 of 25 integrations pinned. sqlite-mcp and aws skipped (packages
not found on npm registry).

* fix: use stable azure/mcp version instead of beta

* feat: add pricing sync script and update model prices from OpenRouter API

- scripts/sync-pricing.py fetches real-time pricing from OpenRouter
- Updated 64 price fields across 13 provider files
- Run periodically or in CI to keep prices current

providers/amazon.toml

@@ -0,0 +1,58 @@
+# amazon — auto-generated from OpenRouter API
+
+[provider]
+id = "amazon"
+display_name = "Amazon"
+api_key_env = "AMAZON_API_KEY"
+base_url = ""
+key_required = true
+
+[[models]]
+id = "nova-2-lite-v1"
+display_name = "Amazon: Nova 2 Lite"
+tier = "fast"
+context_window = 1000000
+max_output_tokens = 65535
+input_cost_per_m = 0.3
+output_cost_per_m = 2.5
+supports_streaming = true
+
+[[models]]
+id = "nova-lite-v1"
+display_name = "Amazon: Nova Lite 1.0"
+tier = "fast"
+context_window = 300000
+max_output_tokens = 5120
+input_cost_per_m = 0.06
+output_cost_per_m = 0.24
+supports_streaming = true
+
+[[models]]
+id = "nova-micro-v1"
+display_name = "Amazon: Nova Micro 1.0"
+tier = "fast"
+context_window = 128000
+max_output_tokens = 5120
+input_cost_per_m = 0.035
+output_cost_per_m = 0.14
+supports_streaming = true
+
+[[models]]
+id = "nova-premier-v1"
+display_name = "Amazon: Nova Premier 1.0"
+tier = "smart"
+context_window = 1000000
+max_output_tokens = 32000
+input_cost_per_m = 2.5
+output_cost_per_m = 12.5
+supports_streaming = true
+
+[[models]]
+id = "nova-pro-v1"
+display_name = "Amazon: Nova Pro 1.0"
+tier = "smart"
+context_window = 300000
+max_output_tokens = 5120
+input_cost_per_m = 0.8
+output_cost_per_m = 3.2
+supports_streaming = true