Add Post Templates feature

- Create templates table with name, body, type, title, target, placeholders
- Add Template model with applyToPost method for placeholder replacement
- Add Livewire Templates/Index component for CRUD operations
- Add templates index view with form and table
- Add /templates route
- Update Posts/Index to support template selection when creating posts
- Templates can be applied to pre-fill post form fields

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

database/migrations/2026_07_27_000000_create_templates_table.php

@@ -0,0 +1,27 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('templates', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->text('body')->nullable();
+            $table->string('type')->nullable(); // blog, twitter, reddit, etc.
+            $table->string('title')->nullable();
+            $table->string('target')->nullable(); // e.g., subreddit for reddit
+            $table->json('placeholders')->nullable(); // JSON array of placeholder keys
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('templates');
+    }
+};