remove: obsolete HTML template processing system

- Remove index.html.template (template processing never implemented)
- Fix empty title in index.html by adding proper default title
- Update documentation to remove references to non-existent:
  - scripts/process-html.sh
  - predev/prebuild npm scripts
  - HTML template processing workflow
- Simplifies build process and fixes broken page title

docs/architecture/PROJECT_STRUCTURE.md

@@ -8,8 +8,7 @@ rxminder/
 ├── 📦 package.json                 # Dependencies and scripts
 ├── ⚙️ vite.config.ts               # Build configuration
 ├── 📝 tsconfig.json                # TypeScript configuration
-├── 🎨 index.html                   # Generated entry point
-├── 🎨 index.html.template          # Template for HTML generation
+├── 🎨 index.html                   # Application entry point
 ├── 🔒 .env.example                 # Environment template
 ├── 📊 metadata.json                # Project metadata
 ├── 🖼️ banner.jpeg                  # Project banner image
@@ -99,7 +98,6 @@ rxminder/
 │
 ├── 📁 scripts/                     # Development and build scripts
 │   ├── 🔧 setup.sh                 # Development setup
-│   ├── 🎨 process-html.sh          # HTML template processing
 │   ├── 🧹 setup-pre-commit.sh      # Git hooks setup
 │   └── 🌱 seed-production.js       # Database seeding
 │
@@ -207,9 +205,9 @@ Centralized configuration with environment-based templates:
 config/
 └── unified.config.ts    # Single source of truth
 
-# Template approach
-index.html.template → index.html    # Processed with environment variables
+# Configuration approach
 .env.example → .env                 # User customization
+config/unified.config.ts            # Centralized configuration
 ```
 
 **Benefits:**
@@ -274,7 +272,6 @@ docs/
 2. **Template Processing**
 
    ```bash
-   bun run predev         # Process HTML templates
    bun run dev            # Start development server
    ```