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/nvidia.toml

@@ -0,0 +1,118 @@
+# nvidia — auto-generated from OpenRouter API
+
+[provider]
+id = "nvidia"
+display_name = "Nvidia"
+api_key_env = "NVIDIA_API_KEY"
+base_url = ""
+key_required = true
+
+[[models]]
+id = "llama-3.1-nemotron-70b-instruct"
+display_name = "NVIDIA: Llama 3.1 Nemotron 70B Instruct"
+tier = "smart"
+context_window = 131072
+max_output_tokens = 16384
+input_cost_per_m = 1.2
+output_cost_per_m = 1.2
+supports_streaming = true
+
+[[models]]
+id = "llama-3.1-nemotron-ultra-253b-v1"
+display_name = "NVIDIA: Llama 3.1 Nemotron Ultra 253B v1"
+tier = "smart"
+context_window = 131072
+max_output_tokens = 16384
+input_cost_per_m = 0.6
+output_cost_per_m = 1.8
+supports_streaming = true
+
+[[models]]
+id = "llama-3.3-nemotron-super-49b-v1.5"
+display_name = "NVIDIA: Llama 3.3 Nemotron Super 49B V1.5"
+tier = "fast"
+context_window = 131072
+max_output_tokens = 16384
+input_cost_per_m = 0.1
+output_cost_per_m = 0.4
+supports_streaming = true
+
+[[models]]
+id = "nemotron-3-nano-30b-a3b"
+display_name = "NVIDIA: Nemotron 3 Nano 30B A3B"
+tier = "fast"
+context_window = 262144
+max_output_tokens = 16384
+input_cost_per_m = 0.05
+output_cost_per_m = 0.2
+supports_streaming = true
+
+[[models]]
+id = "nemotron-3-nano-30b-a3b:free"
+display_name = "NVIDIA: Nemotron 3 Nano 30B A3B (free)"
+tier = "free"
+context_window = 256000
+max_output_tokens = 16384
+input_cost_per_m = 0.0
+output_cost_per_m = 0.0
+supports_streaming = true
+
+[[models]]
+id = "nemotron-3-super-120b-a12b"
+display_name = "NVIDIA: Nemotron 3 Super"
+tier = "fast"
+context_window = 262144
+max_output_tokens = 16384
+input_cost_per_m = 0.1
+output_cost_per_m = 0.5
+supports_streaming = true
+
+[[models]]
+id = "nemotron-3-super-120b-a12b:free"
+display_name = "NVIDIA: Nemotron 3 Super (free)"
+tier = "free"
+context_window = 262144
+max_output_tokens = 262144
+input_cost_per_m = 0.0
+output_cost_per_m = 0.0
+supports_streaming = true
+
+[[models]]
+id = "nemotron-nano-12b-v2-vl"
+display_name = "NVIDIA: Nemotron Nano 12B 2 VL"
+tier = "fast"
+context_window = 131072
+max_output_tokens = 16384
+input_cost_per_m = 0.2
+output_cost_per_m = 0.6
+supports_streaming = true
+
+[[models]]
+id = "nemotron-nano-12b-v2-vl:free"
+display_name = "NVIDIA: Nemotron Nano 12B 2 VL (free)"
+tier = "free"
+context_window = 128000
+max_output_tokens = 128000
+input_cost_per_m = 0.0
+output_cost_per_m = 0.0
+supports_streaming = true
+
+[[models]]
+id = "nemotron-nano-9b-v2"
+display_name = "NVIDIA: Nemotron Nano 9B V2"
+tier = "fast"
+context_window = 131072
+max_output_tokens = 16384
+input_cost_per_m = 0.04
+output_cost_per_m = 0.16
+supports_streaming = true
+
+[[models]]
+id = "nemotron-nano-9b-v2:free"
+display_name = "NVIDIA: Nemotron Nano 9B V2 (free)"
+tier = "free"
+context_window = 128000
+max_output_tokens = 16384
+input_cost_per_m = 0.0
+output_cost_per_m = 0.0
+supports_streaming = true