feat: add environment variables when installing

[hwbrzzl]

📑 Description

✅ Checks

• Added test cases for my code

[Copilot]

Pull Request Overview

This PR adds automatic environment variable configuration during package installation. When installing framework packages (session, route, mail, log, grpc, database), the setup scripts now append required environment variables to .env and .env.example files if they don't already exist.

Key changes:

• Adds Append method to the File interface for appending content to files
• Introduces WhenFileContains and WhenFileNotContains conditional modifiers
• Updates all package setup scripts to append environment variables during installation

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
contracts/packages/modify/modify.go	Adds Append method to File interface
packages/modify/modify.go	Implements Append, WhenFileContains, and WhenFileNotContains functions with debug logging
packages/modify/modify_test.go	Adds test coverage for new conditional modifiers
session/setup/setup.go	Adds session environment variables during installation
route/setup/setup.go	Adds route environment variables during installation
mail/setup/setup.go	Adds mail environment variables during installation
log/setup/setup.go	Adds log environment variables during installation
grpc/setup/setup.go	Adds grpc environment variables during installation
database/setup/setup.go	Adds database environment variables and refactors config content retrieval
errors/list.go	Adds FileNotExist error for better error handling
foundation/application.go	Adds newline to error messages for better formatting

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[codecov]

Codecov Report

❌ Patch coverage is 11.68831% with 136 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.73%. Comparing base (cfae10b) to head (62a87c2).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
mail/setup/setup.go	0.00%	36 Missing ⚠️
log/setup/setup.go	0.00%	34 Missing ⚠️
session/setup/setup.go	0.00%	34 Missing ⚠️
route/setup/setup.go	0.00%	23 Missing ⚠️
grpc/setup/setup.go	0.00%	8 Missing ⚠️
foundation/application.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1239      +/-   ##
==========================================
- Coverage   66.09%   65.73%   -0.36%     
==========================================
  Files         248      248              
  Lines       17069    17185     +116     
==========================================
+ Hits        11282    11297      +15     
- Misses       5410     5511     +101     
  Partials      377      377              

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