fix: expand language IDs, fix AtCoder submit, normalize logging (#353)

## Problem

Language version coverage was incomplete across all platforms, AtCoder
submit used a stale cookie fast-path that caused silent failures, and
raw
`vim.notify` calls throughout the codebase produced inconsistent or
missing `[cp.nvim]:` prefixes.

## Solution

Remove cookie persistence from AtCoder login/submit (always fresh
login),
increase the submit nav timeout to 40s, and switch to in-memory buffer
upload with the correct per-language extension from a full
`_LANGUAGE_ID_EXTENSION`
map covering all 116 AtCoder languages. Expand `LANGUAGE_VERSIONS` in
`constants.lua` with all AtCoder languages, 15 new CF languages with
full
version variants, and 50+ Kattis languages. Fix AtCoder `prolog` ID
(`6079`→`6081`, was Pony) and remove the non-existent `racket` entry.
Replace all raw `vim.notify` calls with `logger.log`. Simplify the
submit
language doc to point at `constants.lua` rather than maintaining a
static table.

lua/cp/constants.lua

@@ -75,14 +75,67 @@ M.signal_codes = {
 
 M.LANGUAGE_VERSIONS = {
   atcoder = {
-    cpp = { ['c++20'] = '6054', ['c++23'] = '6017' },
-    python = { python3 = '6082', pypy3 = '6083' },
+    cpp = { ['c++20'] = '6054', ['c++23'] = '6017', ['c++23-clang'] = '6116' },
+    python = { python3 = '6082', pypy3 = '6083', codon = '6115' },
     java = { java = '6056' },
     rust = { rust = '6088' },
+    c = { c23clang = '6013', c23gcc = '6014' },
+    go = { go = '6051', gccgo = '6050' },
+    haskell = { haskell = '6052' },
+    csharp = { csharp = '6015', ['csharp-aot'] = '6016' },
+    kotlin = { kotlin = '6062' },
+    ruby = { ruby = '6087', truffleruby = '6086' },
+    javascript = { bun = '6057', deno = '6058', nodejs = '6059' },
+    typescript = { deno = '6100', bun = '6101', nodejs = '6102' },
+    scala = { scala = '6090', ['scala-native'] = '6091' },
+    ocaml = { ocaml = '6073' },
+    dart = { dart = '6033' },
+    elixir = { elixir = '6038' },
+    erlang = { erlang = '6041' },
+    fsharp = { fsharp = '6042' },
+    swift = { swift = '6095' },
+    zig = { zig = '6111' },
+    nim = { nim = '6072', ['nim-old'] = '6071' },
+    lua = { lua = '6067', luajit = '6068' },
+    perl = { perl = '6076' },
+    php = { php = '6077' },
+    pascal = { pascal = '6075' },
+    crystal = { crystal = '6028' },
+    d = { dmd = '6030', gdc = '6031', ldc = '6032' },
+    julia = { julia = '6114' },
+    r = { r = '6084' },
+    commonlisp = { commonlisp = '6027' },
+    scheme = { chezscheme = '6092', gauche = '6093' },
+    clojure = { clojure = '6022', ['clojure-aot'] = '6023', babashka = '6021' },
+    ada = { ada = '6002' },
+    bash = { bash = '6008' },
+    fortran = { fortran2023 = '6047', fortran2018 = '6046', fortran77 = '6048' },
+    gleam = { gleam = '6049' },
+    lean = { lean = '6065' },
+    pony = { pony = '6079' },
+    prolog = { prolog = '6081' },
+    vala = { vala = '6106' },
+    v = { v = '6105' },
+    sql = { duckdb = '6118' },
   },
   codeforces = {
-    cpp = { ['c++17'] = '54', ['c++20'] = '89', ['c++23'] = '91' },
-    python = { python3 = '31', pypy3 = '70' },
+    cpp = { ['c++17'] = '54', ['c++20'] = '89', ['c++23'] = '91', c11 = '43' },
+    python = { python3 = '31', pypy3 = '70', python2 = '7', pypy2 = '40', ['pypy3-old'] = '41' },
+    java = { java8 = '36', java21 = '87' },
+    kotlin = { ['1.7'] = '83', ['1.9'] = '88', ['2.2'] = '99' },
+    rust = { ['2021'] = '75', ['2024'] = '98' },
+    go = { go = '32' },
+    csharp = { mono = '9', dotnet3 = '65', dotnet6 = '79', dotnet9 = '96' },
+    haskell = { haskell = '12' },
+    javascript = { v8 = '34', nodejs = '55' },
+    ruby = { ruby = '67' },
+    scala = { scala = '20' },
+    ocaml = { ocaml = '19' },
+    d = { d = '28' },
+    perl = { perl = '13' },
+    php = { php = '6' },
+    pascal = { freepascal = '4', pascalabc = '51' },
+    fsharp = { fsharp = '97' },
   },
   cses = {
     cpp = { ['c++17'] = 'C++17' },
@@ -92,9 +145,58 @@ M.LANGUAGE_VERSIONS = {
   },
   kattis = {
     cpp = { ['c++17'] = 'C++', ['c++20'] = 'C++', ['c++23'] = 'C++' },
-    python = { python3 = 'Python 3' },
+    python = { python3 = 'Python 3', python2 = 'Python 2' },
     java = { java = 'Java' },
     rust = { rust = 'Rust' },
+    ada = { ada = 'Ada' },
+    algol60 = { algol60 = 'Algol 60' },
+    algol68 = { algol68 = 'Algol 68' },
+    apl = { apl = 'APL' },
+    bash = { bash = 'Bash' },
+    bcpl = { bcpl = 'BCPL' },
+    bqn = { bqn = 'BQN' },
+    c = { c = 'C' },
+    cobol = { cobol = 'COBOL' },
+    commonlisp = { commonlisp = 'Common Lisp' },
+    crystal = { crystal = 'Crystal' },
+    csharp = { csharp = 'C#' },
+    d = { d = 'D' },
+    dart = { dart = 'Dart' },
+    elixir = { elixir = 'Elixir' },
+    erlang = { erlang = 'Erlang' },
+    forth = { forth = 'Forth' },
+    fortran = { fortran = 'Fortran' },
+    fortran77 = { fortran77 = 'Fortran 77' },
+    fsharp = { fsharp = 'F#' },
+    gerbil = { gerbil = 'Gerbil' },
+    go = { go = 'Go' },
+    haskell = { haskell = 'Haskell' },
+    icon = { icon = 'Icon' },
+    javascript = { javascript = 'JavaScript (Node.js)', spidermonkey = 'JavaScript (SpiderMonkey)' },
+    julia = { julia = 'Julia' },
+    kotlin = { kotlin = 'Kotlin' },
+    lua = { lua = 'Lua' },
+    modula2 = { modula2 = 'Modula-2' },
+    nim = { nim = 'Nim' },
+    objectivec = { objectivec = 'Objective-C' },
+    ocaml = { ocaml = 'OCaml' },
+    octave = { octave = 'Octave' },
+    odin = { odin = 'Odin' },
+    pascal = { pascal = 'Pascal' },
+    perl = { perl = 'Perl' },
+    php = { php = 'PHP' },
+    pli = { pli = 'PL/I' },
+    prolog = { prolog = 'Prolog' },
+    racket = { racket = 'Racket' },
+    ruby = { ruby = 'Ruby' },
+    scala = { scala = 'Scala' },
+    simula = { simula = 'Simula 67' },
+    smalltalk = { smalltalk = 'Smalltalk' },
+    snobol = { snobol = 'SNOBOL' },
+    swift = { swift = 'Swift' },
+    typescript = { typescript = 'TypeScript' },
+    visualbasic = { visualbasic = 'Visual Basic' },
+    zig = { zig = 'Zig' },
   },
   usaco = {
     cpp = { ['c++11'] = 'cpp', ['c++17'] = 'cpp' },