fix: Add gitignore and remove env files

.gitignore

@@ -0,0 +1,3 @@
+# Ignore .env files
+*.env
+__pycache__/

backend/.env

@@ -1,5 +0,0 @@
-DATABASE_URL=postgresql://neondb_owner:npg_r2AlP8TERojO@ep-silent-hall-a4wl0mwl-pooler.us-east-1.aws.neon.tech/neondb?sslmode=require&channel_binding=require
-JWT_SECRET=18685c70fc30882ac4d79fbeae783f81be6bb9d24d329660e6bb519492e253b7
-JWT_ALGORITHM=HS256
-ACCESS_TOKEN_EXPIRE_HOURS=24
-CORS_ORIGINS=http://localhost:3000,http://localhost:3001,http://127.0.0.1:3000,http://127.0.0.1:3001

mcp-server/.env

@@ -1,5 +0,0 @@
-BACKEND_URL=http://localhost:8000
-MCP_PORT=5000
-OPENROUTER_API_KEY="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"
-OPENROUTER_BASE_URL=https://openrouter.ai/api/v1
-LLM_MODEL=openai/gpt-3.5-turbo