feat: Implement email sending utilities and templates for job notifications

- Added email_service.py for sending emails with SMTP configuration.
- Introduced email_templates.py to render job alert email subjects and bodies.
- Enhanced scraper.py to extract contact information from job listings.
- Updated settings.js to handle negative keyword input validation.
- Created email.html and email_templates.html for managing email subscriptions and templates in the admin interface.
- Modified base.html to include links for email alerts and templates.
- Expanded user settings.html to allow management of negative keywords.
- Updated utils.py to include functions for retrieving negative keywords and email settings.
- Enhanced job filtering logic to exclude jobs containing negative keywords.

web/static/settings.js

@@ -1,4 +1,22 @@
 /* javascript form handling */
+document.addEventListener("DOMContentLoaded", function () {
+  const newNkInput = document.getElementById("new-negative-keyword");
+  if (newNkInput) {
+    newNkInput.addEventListener("input", function () {
+      const val = this.value.trim();
+      const existing = Array.from(
+        document.querySelectorAll('input[name="negative_keyword"]')
+      ).map((el) => el.value);
+      if (existing.includes(val)) {
+        this.setCustomValidity("Keyword already exists");
+        this.reportValidity();
+      } else {
+        this.setCustomValidity("");
+      }
+    });
+  }
+});
+
 document
   .getElementById("user-settings-form")
   .addEventListener("submit", function (event) {
@@ -10,11 +28,15 @@ document
     // Collect selected regions and keywords
     const selectedRegions = [];
     const selectedKeywords = [];
+    const selectedNegativeKeywords = [];
+
     formData.forEach((value, key) => {
       if (key === "region") {
         selectedRegions.push(value);
       } else if (key === "keyword") {
         selectedKeywords.push(value);
+      } else if (key === "negative_keyword") {
+        selectedNegativeKeywords.push(value);
       }
     });
 
@@ -30,10 +52,21 @@ document
       selectedKeywords.push(newKeyword);
     }
 
+    // Add new negative keyword if provided
+    const newNegativeKeyword = formData.get("new-negative-keyword").trim();
+    if (newNegativeKeyword) {
+      if (selectedNegativeKeywords.includes(newNegativeKeyword)) {
+        alert("Negative keyword already exists!");
+        return;
+      }
+      selectedNegativeKeywords.push(newNegativeKeyword);
+    }
+
     // Prepare data to send
     const dataToSend = {
       regions: selectedRegions,
       keywords: selectedKeywords,
+      negative_keywords: selectedNegativeKeywords,
       csrf_token: formData.get("csrf_token"),
     };