feat: initial model catalog with 196 models across 39 providers

Community-maintained TOML catalog for LibreFang. New models can be added
via PR without requiring a LibreFang binary release.

Includes validation script, bilingual docs, and GitHub templates.

providers/venice.toml

@@ -0,0 +1,48 @@
+# Venice.ai — https://venice.ai
+# Models: 3
+
+[provider]
+id = "venice"
+display_name = "Venice.ai"
+api_key_env = "VENICE_API_KEY"
+base_url = "https://api.venice.ai/api/v1"
+key_required = true
+
+[[models]]
+id = "venice-uncensored"
+display_name = "Venice Uncensored"
+tier = "fast"
+context_window = 32000
+max_output_tokens = 8192
+input_cost_per_m = 0.20
+output_cost_per_m = 0.90
+supports_tools = true
+supports_vision = false
+supports_streaming = true
+aliases = ["venice"]
+
+[[models]]
+id = "llama-3.3-70b"
+display_name = "Llama 3.3 70B (Venice)"
+tier = "balanced"
+context_window = 128000
+max_output_tokens = 8192
+input_cost_per_m = 0.20
+output_cost_per_m = 0.90
+supports_tools = true
+supports_vision = false
+supports_streaming = true
+aliases = []
+
+[[models]]
+id = "qwen3-235b-a22b-instruct-2507"
+display_name = "Qwen3 235B A22B (Venice)"
+tier = "smart"
+context_window = 128000
+max_output_tokens = 8192
+input_cost_per_m = 0.20
+output_cost_per_m = 0.90
+supports_tools = true
+supports_vision = false
+supports_streaming = true
+aliases = []