fix: make prompts language-agnostic, support all file types

The plugin now properly detects and uses the file's language based on
its extension, rather than focusing on TypeScript.

Changes:
- Updated all system prompts to use {{language}} placeholder
- Removed hardcoded TypeScript references
- Expanded language mappings to support 50+ file extensions:
  - JavaScript/TypeScript (js, ts, jsx, tsx, mjs, cjs)
  - Python (py, pyw, pyx)
  - Systems (c, cpp, rs, go, zig, nim)
  - JVM (java, kt, scala, clj)
  - Web (html, css, scss, vue, svelte)
  - Scripting (lua, rb, php, sh, bash)
  - .NET (cs, fs, vb)
  - Data (json, yaml, toml, sql, graphql)
  - And many more...

lua/codetyper/llm/init.lua

@@ -67,19 +67,77 @@ function M.build_context(target_path, prompt_type)
 
   -- Map extension to language
   local lang_map = {
+    -- JavaScript/TypeScript
     ts = "TypeScript",
-    tsx = "TypeScript React",
+    tsx = "TypeScript React (TSX)",
     js = "JavaScript",
-    jsx = "JavaScript React",
+    jsx = "JavaScript React (JSX)",
+    mjs = "JavaScript (ESM)",
+    cjs = "JavaScript (CommonJS)",
+    -- Python
     py = "Python",
-    lua = "Lua",
-    go = "Go",
-    rs = "Rust",
-    rb = "Ruby",
-    java = "Java",
+    pyw = "Python",
+    pyx = "Cython",
+    -- Systems languages
     c = "C",
+    h = "C Header",
     cpp = "C++",
+    hpp = "C++ Header",
+    cc = "C++",
+    cxx = "C++",
+    rs = "Rust",
+    go = "Go",
+    -- JVM languages
+    java = "Java",
+    kt = "Kotlin",
+    kts = "Kotlin Script",
+    scala = "Scala",
+    clj = "Clojure",
+    -- Web
+    html = "HTML",
+    css = "CSS",
+    scss = "SCSS",
+    sass = "Sass",
+    less = "Less",
+    vue = "Vue",
+    svelte = "Svelte",
+    -- Scripting
+    lua = "Lua",
+    rb = "Ruby",
+    php = "PHP",
+    pl = "Perl",
+    sh = "Shell (Bash)",
+    bash = "Bash",
+    zsh = "Zsh",
+    fish = "Fish",
+    ps1 = "PowerShell",
+    -- .NET
     cs = "C#",
+    fs = "F#",
+    vb = "Visual Basic",
+    -- Data/Config
+    json = "JSON",
+    yaml = "YAML",
+    yml = "YAML",
+    toml = "TOML",
+    xml = "XML",
+    sql = "SQL",
+    graphql = "GraphQL",
+    -- Other
+    swift = "Swift",
+    dart = "Dart",
+    ex = "Elixir",
+    exs = "Elixir Script",
+    erl = "Erlang",
+    hs = "Haskell",
+    ml = "OCaml",
+    r = "R",
+    jl = "Julia",
+    nim = "Nim",
+    zig = "Zig",
+    v = "V",
+    md = "Markdown",
+    mdx = "MDX",
   }
 
   return {