feat: add environment variables support for agents and collections

- Add envVars field to Agent and Collection models in Prisma schema
- Add envVars to UpdateAgentSchema and UpdateCollectionSchema types
- Implement env vars merging logic (agent overrides collection)
- Pass env vars through tool executor to sandbox
- Add UI for managing env vars in agent and collection settings pages
- Update API routes to handle envVars PATCH updates
- Refactor discord tool execute functions for biome compatibility

This allows users to configure tool-specific environment variables (like
DISCORD_BOT_TOKEN) at both the collection and agent level, with agent
settings taking precedence over collection settings.

pnpm-lock.yaml

@@ -716,6 +716,32 @@ importers:
         specifier: ^5.9.3
         version: 5.9.3
 
+  packages/tools/discord-post:
+    dependencies:
+      ai:
+        specifier: 6.0.23
+        version: 6.0.23(zod@4.3.5)
+    devDependencies:
+      '@tpmjs/tsconfig':
+        specifier: workspace:*
+        version: link:../../config/tsconfig
+      typescript:
+        specifier: ^5.9.3
+        version: 5.9.3
+
+  packages/tools/discord-read:
+    dependencies:
+      ai:
+        specifier: 6.0.23
+        version: 6.0.23(zod@4.3.5)
+    devDependencies:
+      '@tpmjs/tsconfig':
+        specifier: workspace:*
+        version: link:../../config/tsconfig
+      typescript:
+        specifier: ^5.9.3
+        version: 5.9.3
+
   packages/tools/emoji-magic:
     dependencies:
       ai: