feat: add fetch-mining-source edge function

- Add central edge function for mining source fetching with auto token refresh
- Fix refresh_token preservation bug (?? instead of ||)
- Add AGENTS.md instructions for creating edge functions via CLI
- Recreate function using proper supabase CLI command

Author: malek10xdev

AGENTS.md

@@ -84,6 +84,34 @@ npm run build            # Compile TypeScript
 npm run dev:supabase-functions  # Serve functions locally
 ```
 
+#### Creating New Edge Functions
+
+**Always use the Supabase CLI to create new edge functions:**
+
+```bash
+# Create new edge function (auto-generates proper structure)
+npx supabase functions new <function-name>
+```
+
+**Why?** The CLI:
+
+- Creates proper directory structure
+- Sets up deno.json with correct permissions
+- Ensures function is registered with Supabase
+
+**Example workflow:**
+
+```bash
+# 1. Create the function scaffold
+npx supabase functions new my-new-function
+
+# 2. Implement your code in the generated index.ts
+# (copy your implementation into the created file)
+
+# 3. Test locally
+npm run dev:supabase-functions
+```
+
 ## Code Style Guidelines
 
 ### TypeScript Configuration

supabase/config.toml

@@ -337,3 +337,14 @@ entrypoint = "./functions/delete-mining-source/index.ts"
 # Specifies static files to be bundled with the function. Supports glob patterns.
 # For example, if you want to serve static HTML pages in your function:
 # static_files = [ "./functions/delete-mining-source/*.html" ]
+
+[functions.fetch-mining-source]
+enabled = true
+verify_jwt = true
+import_map = "./functions/fetch-mining-source/deno.json"
+# Uncomment to specify a custom file path to the entrypoint.
+# Supported file extensions are: .ts, .js, .mjs, .jsx, .tsx
+entrypoint = "./functions/fetch-mining-source/index.ts"
+# Specifies static files to be bundled with the function. Supports glob patterns.
+# For example, if you want to serve static HTML pages in your function:
+# static_files = [ "./functions/fetch-mining-source/*.html" ]

supabase/functions/fetch-mining-source/.npmrc

@@ -0,0 +1,3 @@
+# Configuration for private npm package dependencies
+# For more information on using private registries with Edge Functions, see:
+# https://supabase.com/docs/guides/functions/import-maps#importing-from-private-registries

supabase/functions/fetch-mining-source/deno.json

@@ -0,0 +1,3 @@
+{
+  "imports": {}
+}