Modernize Neovim configuration with complete tech stack support

[adenix]

Major upgrades:

• Migrated from Packer to lazy.nvim for faster plugin management
• Replaced nvim-lsp-installer with mason.nvim + mason-lspconfig.nvim
• Replaced null-ls with conform.nvim (formatting) and nvim-lint (linting)

Language support enhancements:

• Java: Added nvim-jdtls for Spring Boot and Gradle projects
• TypeScript/JavaScript: Enhanced ts_ls configuration for React/Vite
• Golang: Configured gopls with all modern features and hints
• Python: Added Jupyter notebook support via molten-nvim
• Bash: Full LSP and linting support

New features:

• nvim-dap debugging for Go, Python, and Java
• Bottom horizontal terminal (VS Code style) with toggleterm
• Enhanced nvim-tree with diagnostics and git integration
• which-key for discoverable keybindings
• Modern treesitter configuration for all languages
• Auto-formatting on save with language-specific formatters
• Comprehensive linting with language-specific linters

Files added:

• README.md with full documentation
• ftplugin/java.lua for Java-specific configuration
• lua/user/lazy.lua for lazy.nvim setup
• lua/user/conform.lua for formatting
• lua/user/lint.lua for linting
• lua/user/dap.lua for debugging
• lua/user/molten.lua for Jupyter notebooks
• lua/user/whichkey.lua for keybinding discovery
• lua/user/lsp/mason.lua for LSP management
• lua/user/lsp/settings/* for language-specific LSP configs

Files updated:

• init.lua simplified with lazy.nvim
• lua/user/toggleterm.lua for bottom terminal layout
• lua/user/nvim-tree.lua with enhanced configuration
• lua/user/treesitter.lua with tech stack parsers
• lua/user/keymaps.lua with leader key and new mappings
• lua/user/lsp/init.lua to use mason instead of lsp-installer

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