feat: web upload supports PST, configurable MBOX/PST size limits

- Make MBOX/PST upload size limits configurable via SETTINGS
    (bichon_web_mbox_upload_limit_mb defaults to 1 GB,
     bichon_web_pst_upload_limit_mb defaults to 2 GB)

Cargo.lock

@@ -340,14 +340,10 @@ dependencies = [
  "bichon-core",
  "chrono",
  "clap",
- "codepage-strings",
- "compressed-rtf",
  "console",
  "dialoguer",
- "hex",
  "indicatif",
  "mail-parser",
- "mail-send",
  "memmap2",
  "outlook-pst",
  "reqwest",
@@ -369,6 +365,8 @@ dependencies = [
  "bytes 1.11.1",
  "chrono",
  "clap",
+ "codepage-strings",
+ "compressed-rtf",
  "cron",
  "dashmap",
  "deunicode",
@@ -377,6 +375,7 @@ dependencies = [
  "fjall",
  "futures",
  "governor",
+ "hex",
  "hickory-resolver",
  "html2text",
  "itertools 0.15.0",
@@ -388,6 +387,7 @@ dependencies = [
  "murmur3",
  "num_cpus",
  "oauth2",
+ "outlook-pst",
  "poem-openapi",
  "quick-xml 0.40.0",
  "rand 0.10.1",