Add real media-file probing (session 9, sixteenth delivery)

Wires real container-header probing into the Rename panel's Match step, the
first item on the porting roadmap: aurora-curator-core::probe reads actual
resolution, frame rate, duration, and video/audio codecs straight from a
file's own header (mp4 crate for MP4/M4V/MOV, matroska crate for MKV/WebM,
no ffmpeg/MediaInfo dependency), batched through a new probe_media_files
Tauri command. Probed values fill {resolution}/{video codec}/{audio codec}
only when a filename release tag hasn't already, and populate five bindings
with no filename-tag equivalent at all: {width}, {height}, {fps},
{duration}, {file size}. 8 new Rust unit tests against real ffmpeg-generated
fixture files (161 -> 169 total), verified end to end with a 15-check
Playwright script against npm run dev, and README updated (status
paragraph, project layout, a new "Real media-file probing" section, and
roadmap item 1 narrowed to what's still missing).

Cargo.lock

@@ -120,8 +120,10 @@ name = "aurora-curator-core"
 version = "0.1.0"
 dependencies = [
  "crc32fast",
+ "matroska",
  "md-5",
  "mockito",
+ "mp4",
  "regex",
  "reqwest 0.12.28",
  "rhai",
@@ -180,6 +182,15 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "bitstream-io"
+version = "4.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7eff00be299a18769011411c9def0d827e8f2d7bf0c3dbf53633147a8867fd1f"
+dependencies = [
+ "no_std_io2",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -1936,6 +1947,16 @@ dependencies = [
  "web_atoms",
 ]
 
+[[package]]
+name = "matroska"
+version = "0.30.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d3e606fd165c30a7f5daebca07f9707b2cdca959e0b3dd89538e3e0441b7f52"
+dependencies = [
+ "bitstream-io",
+ "phf",
+]
+
 [[package]]
 name = "md-5"
 version = "0.10.6"
@@ -2023,6 +2044,20 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "mp4"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9ef834d5ed55e494a2ae350220314dc4aacd1c43a9498b00e320e0ea352a5c3"
+dependencies = [
+ "byteorder",
+ "bytes",
+ "num-rational",
+ "serde",
+ "serde_json",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "muda"
 version = "0.19.3"
@@ -2083,12 +2118,52 @@ dependencies = [
  "spin",
 ]
 
+[[package]]
+name = "no_std_io2"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418abd1b6d34fbf6cae440dc874771b0525a604428704c76e48b29a5e67b8003"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c89e69e7e0f03bea5ef08013795c25018e101932225a656383bd384495ecc367"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "521739c6d2bac4aa25192232afe6841231376b2b26d4d9fae5ecf8ca5772e441"
 
+[[package]]
+name = "num-integer"
+version = "0.1.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ce2d95d4b3734dc35aa2f45e1aa22cd416814592a4f9d9205e11affd5b8e10b"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
+dependencies = [
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+ "serde",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"