Update environment configuration files

- Expanded `.env.example` with additional environment variables for local development, including AWS credentials, database connection strings, and API keys.
- Removed the `api/.env.example` file as its contents have been consolidated into the main `.env.example`.

These changes enhance the local development setup by providing a comprehensive example of required environment variables.

.env.example

@@ -1,5 +1,25 @@
-AWS_ACCESS_KEY_ID=
-AWS_SECRET_ACCESS_KEY=
-AWS_REGION=
+AWS_ACCESS_KEY_ID=AKIA....
+AWS_SECRET_ACCESS_KEY=...
+AWS_REGION=us-east-1
 CATALOG_WAREHOUSE=s3://your-warehouse-bucket/
-d
+ENVIRONMENT="development"
+DATABASE_URL="postgresql://postgres:postgres@127.0.0.1:54322/postgres"
+POOLER_URL="postgresql://postgres:postgres@127.0.0.1:54322/postgres"
+JWT_SECRET="super-secret-jwt-token-with-at-least-32-characters-long"
+REDIS_URL="redis://localhost:6379"
+LANGFUSE_API_URL="https://us.cloud.langfuse.com"
+LANGFUSE_PUBLIC_API_KEY="pk..."
+LANGFUSE_PRIVATE_API_KEY="sk..."
+POSTHOG_API_KEY="phc_..."
+OPENAI_API_KEY="sk-..."
+ANTHROPIC_API_KEY="sk-..."
+RESEND_API_KEY="re_..."
+BUSTER_URL="http://localhost:3000"
+BUSTER_WH_TOKEN="buster-wh-token"
+EMBEDDING_PROVIDER="ollama"
+EMBEDDING_MODEL="mxbai-embed-large"
+COHERE_API_KEY="..."
+NEXT_PUBLIC_API_URL="http://127.0.0.1:3001"
+NEXT_PUBLIC_URL="http://localhost:3000"
+NEXT_PUBLIC_SUPABASE_URL="http://127.0.0.1:54321"
+NEXT_PUBLIC_SUPABASE_ANON_KEY="eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6ImFub24iLCJleHAiOjE5ODM4MTI5OTZ9.CRXP1A7WOeoJeXxjNni43kdQwgnWNReilDMblYTn_I0"

api/.env.example

@@ -1,9 +0,0 @@
-ENVIRONMENT="development"
-DATABASE_URL="postgresql://postgres:postgres@127.0.0.1:54322/postgres"
-JWT_SECRET="super-secret-jwt-token-with-at-least-32-characters-long"
-REDIS_URL="redis://127.0.0.1:6379"
-LANGFUSE_API_URL="https://us.cloud.langfuse.com"
-LANGFUSE_PUBLIC_API_KEY="pk-lf-xxxxxx"
-LANGFUSE_PRIVATE_API_KEY="sk-lf-xxxxxx"
-OPENAI_API_KEY="sk-xxxxxx"
-EMBED_VEC_LENGTH="1536"