feat: complete production-quality Model Router AI traffic control platform

.env.example

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+# Model Router Configuration
+
+# Environment mode: development | production | test
+APP_ENV=development
+DEBUG=true
+PORT=8000
+HOST=0.0.0.0
+
+# Database
+DATABASE_URL=sqlite+aiosqlite:///./model_router.db
+
+# Default Router Analyzer: rules | llm
+ROUTER_ANALYZER=rules
+
+# Default Routing Policy: balanced | lowest_cost | lowest_latency | highest_quality | custom
+DEFAULT_ROUTING_POLICY=balanced
+
+# Baseline Model ID for Cost Savings Analytics (e.g. gpt-4o or claude-3-5-sonnet-20241022 or mock-power)
+BASELINE_MODEL_ID=mock-power
+
+# Default Provider Mode: mock | ollama
+DEFAULT_PROVIDER=mock
+
+# Local Ollama URL
+OLLAMA_BASE_URL=http://localhost:11434
+
+# Optional External Providers (leave empty for local/mock development)
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+GEMINI_API_KEY=
+
+# Budgets (USD)
+DAILY_BUDGET=10.00
+MONTHLY_BUDGET=100.00
+PER_REQUEST_BUDGET=1.00
+
+# Retries & Timeouts
+MAX_RETRIES=2
+PROVIDER_TIMEOUT_SECONDS=30.0