Move Schematic dependencies to `peerDependencies` or `devDependencies`

### **Description**
In `src/package.json`, `@schematics/angular` and `@angular-devkit/schematics` are currently listed under `dependencies`. Since these packages are only utilized for build-time tasks and schematic generation (found in `src/schematics` and `tools/`), they should not be included in production bundles.

Including them in `dependencies` causes unnecessary bloat and, more critically, pulls in downstream vulnerabilities that wouldn't otherwise affect the production environment.

### **Current Configuration**
```json
"dependencies": {
"firebase": "^12.4.0",
"rxfire": "^6.1.0",
"@angular-devkit/schematics": "^21.0.0", // Move or Remove
"@schematics/angular": "^21.0.0", // Move or Remove
"tslib": "^2.3.0"
},
```

### **Impact: Dependency Vulnerability**
This misconfiguration currently introduces a vulnerability via `picomatch`, which is a sub-dependency of the Angular devkit. Running a production-only dependency check confirms these are being pulled into the prod graph:

```bash
❯ pm why picomatch --prod
Using pnpm
picomatch@4.0.3
├─┬ @angular-devkit/core@21.2.0
│ ├─┬ @angular-devkit/schematics@21.2.0
│ │ └─┬ @schematics/angular@21.2.0
│ │ └─┬ @angular/fire@21.0.0-rc.0
│ │ └── @my-project/source@0.0.0 (dependencies)
│ └── @schematics/angular@21.2.0 [deduped]
└─┬ @angular-devkit/core@21.2.2
└─┬ @angular-devkit/schematics@21.2.2
└── @angular/fire@21.0.0-rc.0 [deduped]

Found 1 version of picomatch
```

### **Proposed Solution**
1. **Remove** `@schematics/angular` and `@angular-devkit/schematics` if they are only needed for generating code in local development. Any Angular project will have them.
2. **Alternatively**, move them to `peerDependencies` (marked as optional if necessary).

src/package.json から始め、src/schematics と tools/ 配下の参照を調べて、これらのビルド時タスクに必要な依存関係の配置を判断します。報告されている pnpm production dependency check を実行し、pm why picomatch を使って本番グラフを比較します。schematic パッケージが本番依存関係に含まれなくなり、必要なローカル生成タスクが引き続き動作すれば完了です。

索引モデルが issue の本文から書いたものです。