duplicates: perceptual hash + soft-mark resolution + upload 409

Adds pHash + dHash columns alongside the existing blake3 content_hash so
near-duplicates (re-encoded, resized, format-converted copies) become
queryable. /duplicates/{exact,perceptual} return groups; /duplicates/
{resolve,unresolve} flip a duplicate_of_hash soft-mark on losing rows
and union perceptual-only tag sets onto the survivor. The default
/photos listing filters duplicate_of_hash IS NULL so demoted siblings
stop cluttering the grid; include_duplicates=true opts back in for
Apollo's review modal. Upload now hashes bytes pre-write and returns
409 with the canonical sibling when a file's bytes already exist.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -600,6 +600,16 @@ version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6099cdc01846bc367c4e7dd630dc5966dccf36b652fae7a74e17b640411a91b2"
 
+[[package]]
+name = "bk-tree"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8283fb8e64b873918f8bc527efa6aff34956296e48ea750a9c909cd47c01546"
+dependencies = [
+ "fnv",
+ "triple_accel",
+]
+
 [[package]]
 name = "blake3"
 version = "1.8.4"
@@ -1928,6 +1938,7 @@ dependencies = [
  "async-trait",
  "base64",
  "bcrypt",
+ "bk-tree",
  "blake3",
  "bytes",
  "chrono",
@@ -1939,6 +1950,7 @@ dependencies = [
  "futures",
  "ical",
  "image",
+ "image_hasher",
  "indicatif",
  "infer",
  "jsonwebtoken",
@@ -1978,6 +1990,19 @@ dependencies = [
  "quick-error",
 ]
 
+[[package]]
+name = "image_hasher"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd266c66b0a0e2d4c6db8e710663fc163a2d33595ce997b6fbda407c8759d344"
+dependencies = [
+ "base64",
+ "image",
+ "rustdct",
+ "serde",
+ "transpose",
+]
+
 [[package]]
 name = "imgref"
 version = "1.11.0"
@@ -2438,6 +2463,15 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-complex"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73f88a1307638156682bada9d7604135552957b7818057dcef22705b4d509495"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.1.0"
@@ -2907,6 +2941,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
+[[package]]
+name = "primal-check"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc0d895b311e3af9902528fbb8f928688abbd95872819320517cc24ca6b2bd08"
+dependencies = [
+ "num-integer",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.101"
@@ -3286,6 +3329,29 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "rustdct"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b61555105d6a9bf98797c063c362a1d24ed8ab0431655e38f1cf51e52089551"
+dependencies = [
+ "rustfft",
+]
+
+[[package]]
+name = "rustfft"
+version = "6.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21db5f9893e91f41798c88680037dba611ca6674703c1a18601b01a72c8adb89"
+dependencies = [
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "primal-check",
+ "strength_reduce",
+ "transpose",
+]
+
 [[package]]
 name = "rustix"
 version = "1.0.8"
@@ -3624,6 +3690,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
+[[package]]
+name = "strength_reduce"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe895eb47f22e2ddd4dabc02bce419d2e643c8e3b585c78158b349195bc24d82"
+
 [[package]]
 name = "strfmt"
 version = "0.2.5"
@@ -4122,6 +4194,22 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "transpose"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ad61aed86bc3faea4300c7aee358b4c6d0c8d6ccc36524c96e4c92ccf26e77e"
+dependencies = [
+ "num-integer",
+ "strength_reduce",
+]
+
+[[package]]
+name = "triple_accel"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "622b09ce2fe2df4618636fb92176d205662f59803f39e70d1c333393082de96c"
+
 [[package]]
 name = "try-lock"
 version = "0.2.5"